Lenses. Medical search

Pieces of glass or other transparent materials used for magnification or increased visual acuity.

Lenses designed to be worn on the front surface of the eyeball. (UMDNS, 1999)

Soft, supple contact lenses made of plastic polymers which interact readily with water molecules. Many types are available, including continuous and extended-wear versions, which are gas-permeable and easily sterilized.

The at-home administering of nutrients for assimilation and utilization by a patient who cannot maintain adequate nutrition by enteral feeding alone. Nutrients are administered via a route other than the alimentary canal (e.g., intravenously, subcutaneously).

The portion of the crystalline lens surrounding the nucleus and bound anteriorly by the epithelium and posteriorly by the capsule. It contains lens fibers and amorphous, intercellular substance.

Diseases affecting or involving the PARANASAL SINUSES and generally manifesting as inflammation, abscesses, cysts, or tumors.

Mild or moderate loss of motor function accompanied by spasticity in the lower extremities. This condition is a manifestation of CENTRAL NERVOUS SYSTEM DISEASES that cause injury to the motor cortex or descending motor pathways.

The presence of parasites (especially malarial parasites) in the blood. (Dorland, 27th ed)

Partial or complete opacity on or in the lens or capsule of one or both eyes, impairing vision or causing blindness. The many kinds of cataract are classified by their morphology (size, shape, location) or etiology (cause and time of occurrence). (Dorland, 27th ed)

A heterogeneous family of water-soluble structural proteins found in cells of the vertebrate lens. The presence of these proteins accounts for the transparency of the lens. The family is composed of four major groups, alpha, beta, gamma, and delta, and several minor groups, which are classed on the basis of size, charge, immunological properties, and vertebrate source. Alpha, beta, and delta crystallins occur in avian and reptilian lenses, while alpha, beta, and gamma crystallins occur in all other lenses.

Hydrophilic contact lenses worn for an extended period or permanently.

Incomplete rupture of the zonule with the displaced lens remaining behind the pupil. In dislocation, or complete rupture, the lens is displaced forward into the anterior chamber or backward into the vitreous body. When congenital, this condition is known as ECTOPIA LENTIS.

Sterile solutions used to clean and disinfect contact lenses.

Abnormal immunoglobulins synthesized by atypical cells of the MONONUCLEAR PHAGOCYTE SYSTEM. Paraproteins containing only light chains lead to Bence Jones paraproteinemia, while the presence of only atypical heavy chains leads to heavy chain disease. Most of the paraproteins show themselves as an M-component (monoclonal gammopathy) in electrophoresis. Diclonal and polyclonal paraproteins are much less frequently encountered.

The normal decreasing elasticity of the crystalline lens that leads to loss of accommodation.

The dioptric adjustment of the EYE (to attain maximal sharpness of retinal imagery for an object of regard) referring to the ability, to the mechanism, or to the process. Ocular accommodation is the effecting of refractive changes by changes in the shape of the CRYSTALLINE LENS. Loosely, it refers to ocular adjustments for VISION, OCULAR at various distances. (Cline et al., Dictionary of Visual Science, 4th ed)

Refraction of LIGHT effected by the media of the EYE.

The posterior aspect of the casing that surrounds the natural CRYSTALLINE LENS.

A class of crystallins that provides refractive power and translucency to the lens (LENS, CRYSTALLINE) in VERTEBRATES. Beta-crystallins are similar in structure to GAMMA-CRYSTALLINS in that they both contain Greek key motifs. Beta-crystallins exist as oligomers formed from acidic (BETA-CRYSTALLIN A CHAIN) and basic (BETA-CRYSTALLIN B CHAIN) subunits.

The removal of a cataractous CRYSTALLINE LENS from the eye.

Absence of crystalline lens totally or partially from field of vision, from any cause except after cataract extraction. Aphakia is mainly congenital or as result of LENS DISLOCATION AND SUBLUXATION.

A pair of ophthalmic lenses in a frame or mounting which is supported by the nose and ears. The purpose is to aid or improve vision. It does not include goggles or nonprescription sun glasses for which EYE PROTECTIVE DEVICES is available.

A subclass of crystallins that provides the majority of refractive power and translucency to the lens (LENS, CRYSTALLINE) in VERTEBRATES. Alpha-crystallins also act as molecular chaperones that bind to denatured proteins, keep them in solution and thereby maintain the translucency of the lens. The proteins exist as large oligomers that are formed from ALPHA-CRYSTALLIN A CHAIN and ALPHA-CRYSTALLIN B CHAIN subunits.

The organ of sight constituting a pair of globular organs made up of a three-layered roughly spherical structure specialized for receiving and responding to light.

A plant genus of the FABACEAE family known for the seeds used as food.

The transparent anterior portion of the fibrous coat of the eye consisting of five layers: stratified squamous CORNEAL EPITHELIUM; BOWMAN MEMBRANE; CORNEAL STROMA; DESCEMET MEMBRANE; and mesenchymal CORNEAL ENDOTHELIUM. It serves as the first refracting medium of the eye. It is structurally continuous with the SCLERA, avascular, receiving its nourishment by permeation through spaces between the lamellae, and is innervated by the ophthalmic division of the TRIGEMINAL NERVE via the ciliary nerves and those of the surrounding conjunctiva which together form plexuses. (Cline et al., Dictionary of Visual Science, 4th ed)

The anterior aspect of the casing that surrounds the natural CRYSTALLINE LENS.

A refractive error in which rays of light entering the EYE parallel to the optic axis are brought to a focus in front of the RETINA when accommodation (ACCOMMODATION, OCULAR) is relaxed. This results from an overly curved CORNEA or from the eyeball being too long from front to back. It is also called nearsightedness.

A broad family of synthetic organosiloxane polymers containing a repeating silicon-oxygen backbone with organic side groups attached via carbon-silicon bonds. Depending on their structure, they are classified as liquids, gels, and elastomers. (From Merck Index, 12th ed)

A procedure for removal of the crystalline lens in cataract surgery in which an anterior capsulectomy is performed by means of a needle inserted through a small incision at the temporal limbus, allowing the lens contents to fall through the dilated pupil into the anterior chamber where they are broken up by the use of ultrasound and aspirated out of the eye through the incision. (Cline, et al., Dictionary of Visual Science, 4th ed & In Focus 1993;1(1):1)

A subclass of crystallins found in the lens (LENS, CRYSTALLINE) in BIRDS and REPTILES. They are inactive forms of the enzyme argininosuccinate lyase.

Cells that line the inner and outer surfaces of the body by forming cellular layers (EPITHELIUM) or masses. Epithelial cells lining the SKIN; the MOUTH; the NOSE; and the ANAL CANAL derive from ectoderm; those lining the RESPIRATORY SYSTEM and the DIGESTIVE SYSTEM derive from endoderm; others (CARDIOVASCULAR SYSTEM and LYMPHATIC SYSTEM) derive from mesoderm. Epithelial cells can be classified mainly by cell shape and function into squamous, glandular and transitional epithelial cells.

A refractive error in which rays of light entering the eye parallel to the optic axis are brought to a focus behind the retina, as a result of the eyeball being too short from front to back. It is also called farsightedness because the near point is more distant than it is in emmetropia with an equal amplitude of accommodation. (Dorland, 27th ed)

Deviations from the average or standard indices of refraction of the eye through its dioptric or refractive apparatus.

A specialized field of physics and engineering involved in studying the behavior and properties of light and the technology of analyzing, generating, transmitting, and manipulating ELECTROMAGNETIC RADIATION in the visible, infrared, and ultraviolet range.

Clarity or sharpness of OCULAR VISION or the ability of the eye to see fine details. Visual acuity depends on the functions of RETINA, neuronal transmission, and the interpretative ability of the brain. Normal visual acuity is expressed as 20/20 indicating that one can see at 20 feet what should normally be seen at that distance. Visual acuity can also be influenced by brightness, color, and contrast.

Lenses, generally made of plastic or silicone, that are implanted into the eye in front of the natural EYE LENS, by the IRIS, to improve VISION, OCULAR. These intraocular lenses are used to supplement the natural lens instead of replacing it.

Presence of an intraocular lens after cataract extraction.

A class of porins that allow the passage of WATER and other small molecules across CELL MEMBRANES.

The gradual irreversible changes in structure and function of an organism that occur as a result of the passage of time.

Absence of the crystalline lens resulting from cataract extraction.

The basic subunit of beta-crystallins.

Polymers of silicone that are formed by crosslinking and treatment with amorphous silica to increase strength. They have properties similar to vulcanized natural rubber, in that they stretch under tension, retract rapidly, and fully recover to their original dimensions upon release. They are used in the encapsulation of surgical membranes and implants.

The most anterior portion of the uveal layer, separating the anterior chamber from the posterior. It consists of two layers - the stroma and the pigmented epithelium. Color of the iris depends on the amount of melanin in the stroma on reflection from the pigmented epithelium.

The making of a continuous circular tear in the anterior capsule during cataract surgery in order to allow expression or phacoemulsification of the nucleus of the lens. (Dorland, 28th ed)

A condition characterized by recurrent episodes of daytime somnolence and lapses in consciousness (microsomnias) that may be associated with automatic behaviors and AMNESIA. CATAPLEXY; SLEEP PARALYSIS, and hypnagogic HALLUCINATIONS frequently accompany narcolepsy. The pathophysiology of this disorder includes sleep-onset rapid eye movement (REM) sleep, which normally follows stage III or IV sleep. (From Neurology 1998 Feb;50(2 Suppl 1):S2-S7)

The fitting and adjusting of artificial parts of the body. (From Stedman's, 26th ed)

An excessive amount of fluid in the cornea due to damage of the epithelium or endothelium causing decreased visual acuity.

One or more layers of EPITHELIAL CELLS, supported by the basal lamina, which covers the inner or outer surfaces of the body.

Maf proto-oncogene protein is the major cellular homolog of the V-MAF ONCOGENE PROTEIN. It was the first of the mammalian MAF TRANSCRIPTION FACTORS identified, and it is induced in activated T-LYMPHOCYTES and regulates GENETIC TRANSCRIPTION of INTERLEUKIN-4. c-maf is frequently translocated to an immunoglobulin locus in MULTIPLE MYELOMA.

A family of transcription factors that control EMBRYONIC DEVELOPMENT within a variety of cell lineages. They are characterized by a highly conserved paired DNA-binding domain that was first identified in DROSOPHILA segmentation genes.

The front third of the eyeball that includes the structures between the front surface of the cornea and the front of the VITREOUS BODY.

The fluid secreted by the lacrimal glands. This fluid moistens the CONJUNCTIVA and CORNEA.

The measurement of curvature and shape of the anterior surface of the cornea using techniques such as keratometry, keratoscopy, photokeratoscopy, profile photography, computer-assisted image processing and videokeratography. This measurement is often applied in the fitting of contact lenses and in diagnosing corneal diseases or corneal changes including keratoconus, which occur after keratotomy and keratoplasty.

Unequal curvature of the refractive surfaces of the eye. Thus a point source of light cannot be brought to a point focus on the retina but is spread over a more or less diffuse area. This results from the radius of curvature in one plane being longer or shorter than the radius at right angles to it. (Dorland, 27th ed)

Domesticated bovine animals of the genus Bos, usually kept on a farm or ranch and used for the production of meat or dairy products or for heavy labor.

The transparent, semigelatinous substance that fills the cavity behind the CRYSTALLINE LENS of the EYE and in front of the RETINA. It is contained in a thin hyaloid membrane and forms about four fifths of the optic globe.

One of the alpha crystallin subunits. In addition to being expressed in the lens (LENS, CRYSTALLINE), alpha-crystallin B chain has been found in a variety of tissues such as HEART; BRAIN; MUSCLE; and KIDNEY. Accumulation of the protein in the brain is associated with NEURODEGENERATIVE DISEASES such as CREUTZFELDT-JAKOB SYNDROME and ALEXANDER DISEASE.

Congenital or developmental anomaly in which the eyeballs are abnormally small.

A family of Urodela consisting of 15 living genera and about 42 species and occurring in North America, Europe, Asia, and North Africa.

A group of homologous proteins which form the intermembrane channels of GAP JUNCTIONS. The connexins are the products of an identified gene family which has both highly conserved and highly divergent regions. The variety contributes to the wide range of functional properties of gap junctions.

A ring of tissue extending from the scleral spur to the ora serrata of the RETINA. It consists of the uveal portion and the epithelial portion. The ciliary muscle is in the uveal portion and the ciliary processes are in the epithelial portion.

The acidic subunit of beta-crystallins.

The use of statistical and mathematical methods to analyze biological observations and phenomena.

Infection of the cornea by an ameboid protozoan which may cause corneal ulceration leading to blindness.

Loss of epithelial tissue from the surface of the cornea due to progressive erosion and necrosis of the tissue; usually caused by bacterial, fungal, or viral infection.

Diseases of the cornea.

The developmental entity of a fertilized chicken egg (ZYGOTE). The developmental process begins about 24 h before the egg is laid at the BLASTODISC, a small whitish spot on the surface of the EGG YOLK. After 21 days of incubation, the embryo is fully developed before hatching.

A form of fluorescent antibody technique commonly used to detect serum antibodies and immune complexes in tissues and microorganisms in specimens from patients with infectious diseases. The technique involves formation of an antigen-antibody complex which is labeled with fluorescein-conjugated anti-immunoglobulin antibody. (From Bennington, Saunders Dictionary & Encyclopedia of Laboratory Medicine and Technology, 1984)

An enzyme that catalyzes reversibly the oxidation of an aldose to an alditol. It possesses broad specificity for many aldoses. EC 1.1.1.21.

The species Oryctolagus cuniculus, in the family Leporidae, order LAGOMORPHA. Rabbits are born in burrows, furless, and with eyes and ears closed. In contrast with HARES, rabbits have 22 chromosome pairs.

A technique for maintenance or growth of animal organs in vitro. It refers to three-dimensional cultures of undisaggregated tissue retaining some or all of the histological features of the tissue in vivo. (Freshney, Culture of Animal Cells, 3d ed, p1)

A network of cross-linked hydrophilic macromolecules used in biomedical applications.

Method of making images on a sensitized surface by exposure to light or other radiant energy.

Progressive restriction of the developmental potential and increasing specialization of function that leads to the formation of specialized cells, tissues, and organs.

A species of newt in the Salamandridae family in which the larvae transform into terrestrial eft stage and later into an aquatic adult. They occur from Canada to southern United States. Viridescens refers to the greenish color often found in this species.

Clouding or loss of transparency of the posterior lens capsule, usually following CATARACT extraction.

A genus of free-living soil amoebae that produces no flagellate stage. Its organisms are pathogens for several infections in humans and have been found in the eye, bone, brain, and respiratory tract.

The diversion of RADIATION (thermal, electromagnetic, or nuclear) from its original path as a result of interactions or collisions with atoms, molecules, or larger particles in the atmosphere or other media. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)

Diseases affecting the eye.

A noninflammatory, usually bilateral protrusion of the cornea, the apex being displaced downward and nasally. It occurs most commonly in females at about puberty. The cause is unknown but hereditary factors may play a role. The -conus refers to the cone shape of the corneal protrusion. (From Dorland, 27th ed)

Apparatus, devices, or supplies intended for one-time or temporary use.

Congenital absence of or defects in structures of the eye; may also be hereditary.

Polymerized methyl methacrylate monomers which are used as sheets, moulding, extrusion powders, surface coating resins, emulsion polymers, fibers, inks, and films (From International Labor Organization, 1983). This material is also used in tooth implants, bone cements, and hard corneal contact lenses.

A scientific tool based on ULTRASONOGRAPHY and used not only for the observation of microstructure in metalwork but also in living tissue. In biomedical application, the acoustic propagation speed in normal and abnormal tissues can be quantified to distinguish their tissue elasticity and other properties.

Any of the processes by which nuclear, cytoplasmic, or intercellular factors influence the differential control of gene action during the developmental stages of an organism.

An alternative to REFRACTIVE SURGICAL PROCEDURES. A therapeutic procedure for correcting REFRACTIVE ERRORS. It involves wearing CONTACT LENSES designed to force corrective changes to the curvature of the CORNEA that remain after the lenses are removed. The effect is temporary but is maintained by wearing the therapeutic lenses daily, usually during sleep.

Identification of proteins or peptides that have been electrophoretically separated by blot transferring from the electrophoresis gel to strips of nitrocellulose paper, followed by labeling with antibody probes.

Methods and procedures for the diagnosis of diseases of the eye or of vision disorders.

The ten-layered nervous tissue membrane of the eye. It is continuous with the OPTIC NERVE and receives images of external objects and transmits visual impulses to the brain. Its outer surface is in contact with the CHOROID and the inner surface with the VITREOUS BODY. The outer-most layer is pigmented, whereas the inner nine layers are transparent.

A surgical specialty concerned with the structure and function of the eye and the medical and surgical treatment of its defects and diseases.

Centers for storing various parts of the eye for future use.

Electrophoresis in which a polyacrylamide gel is used as the diffusion medium.

The methyl esters of methacrylic acid that polymerize easily and are used as tissue cements, dental materials, and absorbent for biological substances.

That portion of the electromagnetic spectrum immediately below the visible range and extending into the x-ray frequencies. The longer wavelengths (near-UV or biotic or vital rays) are necessary for the endogenous synthesis of vitamin D and are also called antirachitic rays; the shorter, ionizing wavelengths (far-UV or abiotic or extravital rays) are viricidal, bactericidal, mutagenic, and carcinogenic and are used as disinfectants.

Damage or trauma inflicted to the eye by external means. The concept includes both surface injuries and intraocular injuries.

A light microscopic technique in which only a small spot is illuminated and observed at a time. An image is constructed through point-by-point scanning of the field in this manner. Light sources may be conventional or laser, and fluorescence or transmitted observations are possible.

The white, opaque, fibrous, outer tunic of the eyeball, covering it entirely excepting the segment covered anteriorly by the cornea. It is essentially avascular but contains apertures for vessels, lymphatics, and nerves. It receives the tendons of insertion of the extraocular muscles and at the corneoscleral junction contains the canal of Schlemm. (From Cline et al., Dictionary of Visual Science, 4th ed)

Measurement of distances or movements by means of the phenomena caused by the interference of two rays of light (optical interferometry) or of sound (acoustic interferometry).

Behavior of LIGHT and its interactions with itself and materials.

A monosynaptic reflex elicited by stimulating a nerve, particularly the tibial nerve, with an electric shock.

A technique that localizes specific nucleic acid sequences within intact chromosomes, eukaryotic cells, or bacterial cells through the use of specific nucleic acid-labeled probes.

Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories.

The only family of the order SCANDENTIA, variously included in the order Insectivora or in the order Primates, and often in the order Microscelidea, consisting of five genera. They are TUPAIA, Ananthana (Indian tree shrew), Dendrogale (small smooth-tailed tree shrew), Urogale (Mindanao tree shrew), and Ptilocercus (pen-tailed tree shrew). The tree shrews inhabit the forest areas of eastern Asia from India and southwestern China to Borneo and the Philippines.

That portion of the electromagnetic spectrum in the visible, ultraviolet, and infrared range.

Methods of creating machines and devices.

Maf transcription factors are a family of basic-leucine zipper transcription factors that are closely related to V-MAF ONCOGENE PROTEIN. The C-MAF PROTO-ONCOGENE PROTEIN was the first mammalian Maf transcription factor identified, and now the family is known to include a variety of other Maf proteins such as MAFB TRANSCRIPTION FACTOR; MAFF TRANSCRIPTION FACTOR; MAFG TRANSCRIPTION FACTOR; and MAFK TRANSCRIPTION FACTOR.

Connections between cells which allow passage of small molecules and electric current. Gap junctions were first described anatomically as regions of close apposition between cells with a narrow (1-2 nm) gap between cell membranes. The variety in the properties of gap junctions is reflected in the number of CONNEXINS, the family of proteins which form the junctions.

The clear, watery fluid which fills the anterior and posterior chambers of the eye. It has a refractive index lower than the crystalline lens, which it surrounds, and is involved in the metabolism of the cornea and the crystalline lens. (Cline et al., Dictionary of Visual Science, 4th ed, p319)

A superorder in the class CEPHALOPODA, consisting of the orders Octopoda (octopus) with over 200 species and Vampyromorpha with a single species. The latter is a phylogenetic relic but holds the key to the origins of Octopoda.

The absence or restriction of the usual external sensory stimuli to which the individual responds.

The aperture in the iris through which light passes.

One of a group of nonenzymatic reactions in which aldehydes, ketones, or reducing sugars react with amino acids, peptides, or proteins. Food browning reactions, such as those that occur with cooking of meats, and also food deterioration reactions, resulting in decreased nutritional value and color changes, are attributed to this reaction type. The Maillard reaction is studied by scientists in the agriculture, food, nutrition, and carbohydrate chemistry fields.

A variation of the PCR technique in which cDNA is made from RNA via reverse transcription. The resultant cDNA is then amplified using standard PCR protocols.

Microscopy in which the object is examined directly by an electron beam scanning the specimen point-by-point. The image is constructed by detecting the products of specimen interactions that are projected above the plane of the sample, such as backscattered electrons. Although SCANNING TRANSMISSION ELECTRON MICROSCOPY also scans the specimen point by point with the electron beam, the image is constructed by detecting the electrons, or their interaction products that are transmitted through the sample plane, so that is a form of TRANSMISSION ELECTRON MICROSCOPY.

The condition of where images are correctly brought to a focus on the retina.

Personal devices for protection of the eyes from impact, flying objects, glare, liquids, or injurious radiation.

Common name for the species Gallus gallus, the domestic fowl, in the family Phasianidae, order GALLIFORMES. It is descended from the red jungle fowl of SOUTHEAST ASIA.

RNA sequences that serve as templates for protein synthesis. Bacterial mRNAs are generally primary transcripts in that they do not require post-transcriptional processing. Eukaryotic mRNA is synthesized in the nucleus and must be exported to the cytoplasm for translation. Most eukaryotic mRNAs have a sequence of polyadenylic acid at the 3' end, referred to as the poly(A) tail. The function of this tail is not known for certain, but it may play a role in the export of mature mRNA from the nucleus as well as in helping stabilize some mRNA molecules by retarding their degradation in the cytoplasm.

Proteins encoded by homeobox genes (GENES, HOMEOBOX) that exhibit structural similarity to certain prokaryotic and eukaryotic DNA-binding proteins. Homeodomain proteins are involved in the control of gene expression during morphogenesis and development (GENE EXPRESSION REGULATION, DEVELOPMENTAL).

The outer of the three germ layers of an embryo.

Processes and properties of the EYE as a whole or of any of its parts.

Neurological condition characterized by disturbances in VISUAL PERCEPTION, most often of BODY SCHEMA, TIME PERCEPTION and HALLUCINATIONS. It is associated with MIGRAINE, infections (e.g., INFECTIOUS MONONUCLEOSIS), FEVER, EPILEPSY, and other neurological and psychiatric disorders.

Experimentally produced harmful effects of ionizing or non-ionizing RADIATION in CHORDATA animals.

Stratified squamous epithelium that covers the outer surface of the CORNEA. It is smooth and contains many free nerve endings.

Elements of limited time intervals, contributing to particular results or situations.

Liquid chromatographic techniques which feature high inlet pressures, high sensitivity, and high speed.

A biocompatible, hydrophilic, inert gel that is permeable to tissue fluids. It is used as an embedding medium for microscopy, as a coating for implants and prostheses, for contact lenses, as microspheres in adsorption research, etc.

Filaments 7-11 nm in diameter found in the cytoplasm of all cells. Many specific proteins belong to this group, e.g., desmin, vimentin, prekeratin, decamin, skeletin, neurofilin, neurofilament protein, and glial fibrillary acid protein.

Deeply perforating or puncturing type intraocular injuries.

Sterile solutions that are intended for instillation into the eye. It does not include solutions for cleaning eyeglasses or CONTACT LENS SOLUTIONS.

Laboratory mice that have been produced from a genetically manipulated EGG or EMBRYO, MAMMALIAN.

Removal of the whole or part of the vitreous body in treating endophthalmitis, diabetic retinopathy, retinal detachment, intraocular foreign bodies, and some types of glaucoma.

The disodium salt of selenious acid. It is used therapeutically to supply the trace element selenium and is prepared by the reaction of SELENIUM DIOXIDE with SODIUM HYDROXIDE.

Electrophoresis in which a second perpendicular electrophoretic transport is performed on the separate components resulting from the first electrophoresis. This technique is usually performed on polyacrylamide gels.

The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION.

Suppurative inflammation of the tissues of the internal structures of the eye frequently associated with an infection.

A DNA-binding protein that interacts with methylated CPG ISLANDS. It plays a role in repressing GENETIC TRANSCRIPTION and is frequently mutated in RETT SYNDROME.

A tripeptide with many roles in cells. It conjugates to drugs to make them more soluble for excretion, is a cofactor for some enzymes, is involved in protein disulfide bond rearrangement and reduces peroxides.

An optical source that emits photons in a coherent beam. Light Amplification by Stimulated Emission of Radiation (LASER) is brought about using devices that transform light of varying frequencies into a single intense, nearly nondivergent beam of monochromatic radiation. Lasers operate in the infrared, visible, ultraviolet, or X-ray regions of the spectrum.

The professional practice of primary eye and vision care that includes the measurement of visual refractive power and the correction of visual defects with lenses or glasses.

Inanimate objects that become enclosed in the eye.

Proteins which maintain the transcriptional quiescence of specific GENES or OPERONS. Classical repressor proteins are DNA-binding proteins that are normally bound to the OPERATOR REGION of an operon, or the ENHANCER SEQUENCES of a gene until a signal occurs that causes their release.

Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others.

The physiological renewal, repair, or replacement of tissue.

A family of Primates of the suborder Strepsirhini containing six genera. The family is distributed in parts of Africa, India, Asia, and the Philippines. The six genera are: Arctocebus (golden potto), GALAGO (bush babies), Loris (slender loris), Nycticebus (slow loris), and Perodicticus (potto). Lorises and pottos are relatively common except for Arctocebus, the golden potto. All are arboreal and nocturnal.

The sequence of PURINES and PYRIMIDINES in nucleic acids and polynucleotides. It is also called nucleotide sequence.

The presence of an infectious agent on instruments, prostheses, or other inanimate articles.

Disorder occurring in the central or peripheral area of the cornea. The usual degree of transparency becomes relatively opaque.

The distance between the anterior and posterior poles of the eye, measured either by ULTRASONOGRAPHY or by partial coherence interferometry.

A polyhydric alcohol with about half the sweetness of sucrose. Sorbitol occurs naturally and is also produced synthetically from glucose. It was formerly used as a diuretic and may still be used as a laxative and in irrigating solutions for some surgical procedures. It is also used in many manufacturing processes, as a pharmaceutical aid, and in several research applications.

Refers to animals in the period of time just after birth.

Partial or total replacement of all layers of a central portion of the cornea.

Each of the upper and lower folds of SKIN which cover the EYE when closed.

The amount time between exposure to an infectious agent and becoming symptomatic.

The use of photothermal effects of LASERS to coagulate, incise, vaporize, resect, dissect, or resurface tissue.

A family of sequence-related proteins similar to HMGB1 PROTEIN that contains specific HMG-BOX DOMAINS.

The process in which light signals are transformed by the PHOTORECEPTOR CELLS into electrical signals which can then be transmitted to the brain.

A mass spectrometric technique that is used for the analysis of large biomolecules. Analyte molecules are embedded in an excess matrix of small organic molecules that show a high resonant absorption at the laser wavelength used. The matrix absorbs the laser energy, thus inducing a soft disintegration of the sample-matrix mixture into free (gas phase) matrix and analyte molecules and molecular ions. In general, only molecular ions of the analyte molecules are produced, and almost no fragmentation occurs. This makes the method well suited for molecular weight determinations and mixture analysis.

OPPORTUNISTIC INFECTIONS with the soil fungus FUSARIUM. Typically the infection is limited to the nail plate (ONYCHOMYCOSIS). The infection can however become systemic especially in an IMMUNOCOMPROMISED HOST (e.g., NEUTROPENIA) and results in cutaneous and subcutaneous lesions, fever, KERATITIS, and pulmonary infections.

Pathologic processes that affect patients after a surgical procedure. They may or may not be related to the disease for which the surgery was done, and they may or may not be direct results of the surgery.

The ability of a substance to be dissolved, i.e. to form a solution with another substance. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)

The sum of the weight of all the atoms in a molecule.

Theoretical representations that simulate the behavior or activity of biological processes or diseases. For disease models in living animals, DISEASE MODELS, ANIMAL is available. Biological models include the use of mathematical equations, computers, and other electronic equipment.

Rendering pathogens harmless through the use of heat, antiseptics, antibacterial agents, etc.

The complex processes of initiating CELL DIFFERENTIATION in the embryo. The precise regulation by cell interactions leads to diversity of cell types and specific pattern of organization (EMBRYOGENESIS).

The plan and delineation of prostheses in general or a specific prosthesis.

The use of an aberrometer to measure eye tissue imperfections or abnormalities based on the way light passes through the eye which affects the ability of the eye to focus properly.

A species of baboon in the family CERCOPITHECIDAE, which has a well-studied trilevel social structure consisting of troops, bands, and clans.

Agents causing contraction of the pupil of the eye. Some sources use the term miotics only for the parasympathomimetics but any drug used to induce miosis is included here.

A barbiturate that is effective as a hypnotic and sedative.

Visual impairments limiting one or more of the basic functions of the eye: visual acuity, dark adaptation, color vision, or peripheral vision. These may result from EYE DISEASES; OPTIC NERVE DISEASES; VISUAL PATHWAY diseases; OCCIPITAL LOBE diseases; OCULAR MOTILITY DISORDERS; and other conditions (From Newell, Ophthalmology: Principles and Concepts, 7th ed, p132).

A naturally occurring product of plants obtained following reduction of GALACTOSE. It appears as a white crystalline powder with a slight sweet taste. It may form in excess in the lens of the eye in GALACTOSEMIAS, a deficiency of GALACTOKINASE.

The mucous membrane that covers the posterior surface of the eyelids and the anterior pericorneal surface of the eyeball.

The protein components of ferritins. Apoferritins are shell-like structures containing nanocavities and ferroxidase activities. Apoferritin shells are composed of 24 subunits, heteropolymers in vertebrates and homopolymers in bacteria. In vertebrates, there are two types of subunits, light chain and heavy chain. The heavy chain contains the ferroxidase activity.

A subclass of SOX transcription factors that are expressed in neuronal tissue where they may play a role in the regulation of CELL DIFFERENTIATION. Members of this subclass are generally considered to be transcriptional activators.

Examination of the angle of the anterior chamber of the eye with a specialized optical instrument (gonioscope) or a contact prism lens.

An objective determination of the refractive state of the eye (NEARSIGHTEDNESS; FARSIGHTEDNESS; ASTIGMATISM). By using a RETINOSCOPE, the amount of correction and the power of lens needed can be determined.

Preparation for electron microscopy of minute replicas of exposed surfaces of the cell which have been ruptured in the frozen state. The specimen is frozen, then cleaved under high vacuum at the same temperature. The exposed surface is shadowed with carbon and platinum and coated with carbon to obtain a carbon replica.

Shiny, flexible bands of fibrous tissue connecting together articular extremities of bones. They are pliant, tough, and inextensile.

A group of inherited enzyme deficiencies which feature elevations of GALACTOSE in the blood. This condition may be associated with deficiencies of GALACTOKINASE; UDPGLUCOSE-HEXOSE-1-PHOSPHATE URIDYLYLTRANSFERASE; or UDPGLUCOSE 4-EPIMERASE. The classic form is caused by UDPglucose-Hexose-1-Phosphate Uridylyltransferase deficiency, and presents in infancy with FAILURE TO THRIVE; VOMITING; and INTRACRANIAL HYPERTENSION. Affected individuals also may develop MENTAL RETARDATION; JAUNDICE; hepatosplenomegaly; ovarian failure (PRIMARY OVARIAN INSUFFICIENCY); and cataracts. (From Menkes, Textbook of Child Neurology, 5th ed, pp61-3)

Individuals or groups with no or inadequate health insurance coverage. Those falling into this category usually comprise three primary groups: the medically indigent (MEDICAL INDIGENCY); those whose clinical condition makes them medically uninsurable; and the working uninsured.

An in situ method for detecting areas of DNA which are nicked during APOPTOSIS. Terminal deoxynucleotidyl transferase is used to add labeled dUTP, in a template-independent manner, to the 3 prime OH ends of either single- or double-stranded DNA. The terminal deoxynucleotidyl transferase nick end labeling, or TUNEL, assay labels apoptosis on a single-cell level, making it more sensitive than agarose gel electrophoresis for analysis of DNA FRAGMENTATION.

Microscopy using an electron beam, instead of light, to visualize the sample, thereby allowing much greater magnification. The interactions of ELECTRONS with specimens are used to provide information about the fine structure of that specimen. In TRANSMISSION ELECTRON MICROSCOPY the reactions of the electrons that are transmitted through the specimen are imaged. In SCANNING ELECTRON MICROSCOPY an electron beam falls at a non-normal angle on the specimen and the image is derived from the reactions occurring above the plane of the specimen.

Strains of mice in which certain GENES of their GENOMES have been disrupted, or "knocked-out". To produce knockouts, using RECOMBINANT DNA technology, the normal DNA sequence of the gene being studied is altered to prevent synthesis of a normal gene product. Cloned cells in which this DNA alteration is successful are then injected into mouse EMBRYOS to produce chimeric mice. The chimeric mice are then bred to yield a strain in which all the cells of the mouse contain the disrupted gene. Knockout mice are used as EXPERIMENTAL ANIMAL MODELS for diseases (DISEASE MODELS, ANIMAL) and to clarify the functions of the genes.

A six carbon compound related to glucose. It is found naturally in citrus fruits and many vegetables. Ascorbic acid is an essential nutrient in human diets, and necessary to maintain connective tissue and bone. Its biologically active form, vitamin C, functions as a reducing agent and coenzyme in several metabolic pathways. Vitamin C is considered an antioxidant.

The science dealing with the establishment and maintenance of health in the individual and the group. It includes the conditions and practices conducive to health. (Webster, 3d ed)

An exotic species of the family CYPRINIDAE, originally from Asia, that has been introduced in North America. They are used in embryological studies and to study the effects of certain chemicals on development.

An enzyme that catalyzes the active transport system of sodium and potassium ions across the cell wall. Sodium and potassium ions are closely coupled with membrane ATPase which undergoes phosphorylation and dephosphorylation, thereby providing energy for transport of these ions against concentration gradients.

A genus of tree shrews of the family TUPAIIDAE which consists of about 12 species. One of the most frequently encountered species is T. glis. Members of this genus inhabit rain forests and secondary growth areas in southeast Asia.

Any of several processes in which undesirable impurities in water are removed or neutralized; for example, chlorination, filtration, primary treatment, ion exchange, and distillation. It includes treatment of WASTE WATER to provide potable and hygienic water in a controlled or closed environment as well as provision of public drinking water supplies.

A strong oxidizing agent used in aqueous solution as a ripening agent, bleach, and topical anti-infective. It is relatively unstable and solutions deteriorate over time unless stabilized by the addition of acetanilide or similar organic materials.

An intermediate filament protein found in most differentiating cells, in cells grown in tissue culture, and in certain fully differentiated cells. Its insolubility suggests that it serves a structural function in the cytoplasm. MW 52,000.

A family of small polypeptide growth factors that share several common features including a strong affinity for HEPARIN, and a central barrel-shaped core region of 140 amino acids that is highly homologous between family members. Although originally studied as proteins that stimulate the growth of fibroblasts this distinction is no longer a requirement for membership in the fibroblast growth factor family.

Organic siloxanes which are polymerized to the oily stage. The oils have low surface tension and density less than 1. They are used in industrial applications and in the treatment of retinal detachment, complicated by proliferative vitreoretinopathy.

Cysteine proteinase found in many tissues. Hydrolyzes a variety of endogenous proteins including NEUROPEPTIDES; CYTOSKELETAL PROTEINS; proteins from SMOOTH MUSCLE; CARDIAC MUSCLE; liver; platelets; and erythrocytes. Two subclasses having high and low calcium sensitivity are known. Removes Z-discs and M-lines from myofibrils. Activates phosphorylase kinase and cyclic nucleotide-independent protein kinase. This enzyme was formerly listed as EC 3.4.22.4.

Making measurements by the use of stereoscopic photographs.

An imaging method using LASERS that is used for mapping subsurface structure. When a reflective site in the sample is at the same optical path length (coherence) as the reference mirror, the detector observes interference fringes.

The role of optical defocus in regulating refractive development in infant monkeys. (1/242)

Early in life, the two eyes of infant primates normally grow in a coordinated manner toward the ideal refractive state. We investigated the extent to which lens-induced changes in the effective focus of the eye affected refractive development in infant rhesus monkeys. The main finding was that spectacle lenses could predictably alter the growth of one or both eyes resulting in appropriate compensating refractive changes in both the hyperopic and myopic directions. Although the effective operating range of the emmetropization process in young monkeys is somewhat limited, the results demonstrate that emmetropization in this higher primate, as in a number of other species, is an active process that is regulated by optical defocus associated with the eye's effective refractive state. (+info)

The growing eye: an autofocus system that works on very poor images. (2/242)

It is unknown which retinal image features are analyzed to control axial eye growth and refractive development. On the other hand, identification of these features is fundamental for the understanding of visually acquired refractive errors. Cyclopleged chicks were individually kept in the center of a drum with only one viewing distance possible. Defocusing spectacle lenses were used to stimulate the retina with defined defocus of similar magnitude but different sign. If spatial frequency content and contrast were the only cues analyzed by the retina, all chicks should have become myopic. However, compensatory eye growth was still always in the right direction. The most likely cues for emmetropization, spatial frequency content and image contrast, do therefore not correlate with the elongation of the eye. Rather, the sign of defocus was extracted even from very poor images. (+info)

Long-term changes in retinal contrast sensitivity in chicks from frosted occluders and drugs: relations to myopia? (3/242)

Experiments in animal models have shown that the retinal analyzes the image to identify the position of the plane of focus and fine-tunes the growth of the underlying sclera. It is fundamental to the understanding of the development of refractive errors to know which image features are processed. Since the position of the image plane fluctuates continuously with accommodative status and viewing distance, a meaningful control of refractive development can only occur by an averaging procedure with a long time constant. As a candidate for a retinal signal for enhanced eye growth and myopia we propose the level of contrast adaptation which varies with the average amount of defocus. Using a behavioural paradigm, we have found in chickens (1) that contrast adaptation (CA, here referred to as an increase in contrast sensitivity) occurs at low spatial frequencies (0.2 cyc/deg) already after 1.5 h of wearing frosted goggles which cause deprivation myopia, (2) that CA also occurs with negative lenses (-7.4D) and positive lenses (+6.9D) after 1.5 h, at least if accommodation is paralyzed and, (3) that CA occurs at a retinal level or has, at least, a retinal component. Furthermore, we have studied the effects of atropine and reserpine, which both suppress myopia development, on CA. Quisqualate, which causes retinal degeneration but leaves emmetropization functional, was also tested. We found that both atropine and reserpine increase contrast sensitivity to a level where no further CA could be induced by frosted goggles. Quisqualate increased only the variability of refractive development and of contrast sensitivity. Taken together, CA occurring during extended periods of defocus is a possible candidate for a retinal error signal for myopia development. However, the situation is complicated by the fact that there must be a second image processing mode generating a powerful inhibitory growth signal if the image is in front of the retina, even with poor images (Diether, S., & Schaeffel, F. (1999). (+info)

The response to prism deviations in human infants. (4/242)

Previous research has suggested that infants are unable to make a corrective eye movement in response to a small base-out prism placed in front of one eye before 14-16 weeks [1]. Three hypotheses have been proposed to explain this early inability, and each of these makes different predictions for the time of onset of a response to a larger prism. The first proposes that infants have a 'degraded sensory capacity' and so require a larger retinal disparity (difference in the position of the image on the retina of each eye) to stimulate disparity detectors [2]. This predicts that infants might respond at an earlier age than previously reported [1] when tested using a larger prism. The second hypothesis proposes that infants learn to respond to larger retinal disparities through practice with small disparities [3]. According to this theory, using a larger prism will not result in developmentally earlier responses, and may even delay the response. The third hypothesis proposes that the ability to respond to prismatic deviation depends on maturational factors indicated by the onset of stereopsis (the ability to detect depth in an image on the basis of retinal disparity cues only) [4] [5], predicting that the size of the prism is irrelevant. To differentiate between these hypotheses, we tested 192 infants ranging from 2 to 52 weeks of age using a larger prism. Results showed that 63% of infants of 5-8 weeks of age produced a corrective eye movement in response to placement of a prism in front of the eye when in the dark. Both the percentage of infants who produced a response, and the speed of the response, increased with age. These results suggest that infants can make corrective eye movements in response to large prismatic deviations before 14-16 weeks of age. This, in combination with other recent results [6], discounts previous hypotheses. (+info)

Recent developments in clinical photography. (5/242)

A system comprising a clinical camera, specialized retractors, and a new occlusal mirror are described to maximize the quality of both intra-oral and extra-oral photography in the multi-user situation. (+info)

Effect of adaptation to telescopic spectacles on the initial human horizontal vestibuloocular reflex. (6/242)

Gain of the vestibuloocular reflex (VOR) not only varies with target distance and rotational axis, but can be chronically modified in response to prolonged wearing of head-mounted magnifiers. This study examined the effect of adaptation to telescopic spectacles on the variation of the VOR with changes in target distance and yaw rotational axis for head velocity transients having peak accelerations of 2,800 and 1,000 degrees /s(2). Eye and head movements were recorded with search coils in 10 subjects who underwent whole body rotations around vertical axes that were 10 cm anterior to the eyes, centered between the eyes, between the otoliths, or 20 cm posterior to the eyes. Immediately before each rotation, subjects viewed a target 15 or 500 cm distant. Lighting was extinguished immediately before and was restored after completion of each rotation. After initial rotations, subjects wore 1.9x magnification binocular telescopic spectacles during their daily activities for at least 6 h. Test spectacles were removed and measurement rotations were repeated. Of the eight subjects tolerant of adaptation to the telescopes, six demonstrated VOR gain enhancement after adaptation, while gain in two subjects was not increased. For all subjects, the earliest VOR began 7-10 ms after onset of head rotation regardless of axis eccentricity or target distance. Regardless of adaptation, VOR gain for the proximate target exceeded that for the distant target beginning at 20 ms after onset of head rotation. Adaptation increased VOR gain as measured 90-100 ms after head rotation onset by an average of 0.12 +/- 0.02 (SE) for the higher head acceleration and 0.19 +/- 0.02 for the lower head acceleration. After adaptation, four subjects exhibited significant increases in the canal VOR gain only, whereas two subjects exhibited significant increases in both angular and linear VOR gains. The latencies of linear and early angular target distance effects on VOR gain were unaffected by adaptation. The earliest significant change in angular VOR gain in response to adaptation occurred 50 and 68 ms after onset of the 2,800 and 1,000 degrees /s(2) peak head accelerations, respectively. The latency of the adaptive increase in linear VOR gain was approximately 50 ms for the peak head acceleration of 2,800 degrees /s(2), and 100 ms for the peak head acceleration of 1,000 degrees /s(2). Thus VOR gain changes and latency were consistent with modification in the angular VOR in most subjects, and additionally in the linear VOR in a minority of subjects. (+info)

Clinical effect of low vision aids. (7/242)

The number of patients with low vision is increasing as life expectancy increases. In addition, the interest and demand for low vision aids are also increasing with improved socioeconomic status and the development of mass media. Therefore, it is imperative to recognize the importance of low vision aids. We reviewed the clinical records of 118 patients who visited our low vision clinic more than twice. According to the data analyzed, optic nerve atrophy, retinal degeneration, diabetic retinopathy and age-related macular degeneration were the most common causes of low vision in these patients. The best corrected visual acuities without low vision aids were less than 0.3, but with the help of low vision aids, vision improved to more than 0.4 in 87% of the patients for near vision, and 56% for distant vision. The patients had complained that they could not read books, see a blackboard, recognize a person at a distance, and had other problems because of low vision. However, with the use of low vision aids their satisfaction with their vision rose to 70%. Hand magnifiers, high-powered spectacle lenses, and stand magnifiers were the low vision aids commonly used by people for near vision, while the Galilean telescope and Keplerian telescope were the most popular devices used for distant vision. In conclusion, low vision aids are very helpful devices to patients with low vision. (+info)

Form-deprivation myopia in monkeys is a graded phenomenon. (8/242)

To shed light on the potential role of the phenomenon of form-deprivation myopia in normal refractive development, we investigated the degree of image degradation required to produce axial myopia in rhesus monkeys. Starting at about 3 weeks of age, diffuser spectacle lenses were employed to degrade the retinal image in one eye of 13 infant monkeys. The diffusers were worn continuously for periods ranging between 11 and 19 weeks. The effects of three different strengths of optical diffusers, which produced reductions in image contrast that ranged from about 0.5 to nearly 3 log units, were assessed by retinoscopy and A-scan ultrasonography. Control data were obtained from ten normal infants and three infants reared with clear, zero-powered lenses over both eyes. Eleven of the 13 treated infants developed form-deprivation myopia. Qualitatively similar results were obtained for the three diffuser groups, however, the degree of axial myopia varied directly with the degree of image degradation. Thus, form-deprivation myopia in monkeys is a graded phenomenon and can be triggered by a modest degree of chronic image degradation. (+info)

Uncoated glasses lens (top) versus lens with antireflective coating. Note the tinted reflection from the coated lens. ... Corrective lenses[edit]. Opticians may recommend "anti-reflection lenses" because the decreased reflection enhances the ... Antireflective ophthalmic lenses should not be confused with polarized lenses, which decrease (by absorption) the visible glare ... Examples include anti-glare coatings on corrective lenses and camera lens elements, and antireflective coatings on solar cells. ...

https://en.wikipedia.org/wiki/Antireflection

A gradient-index lens with a parabolic variation of refractive index (n) with radial distance (x). The lens focuses light in ... It determines the focusing power of lenses, the dispersive power of prisms, the reflectivity of lens coatings, and the light- ... 276 The crystalline lens of the human eye is an example of a GRIN lens with a refractive index varying from about 1.406 in the ... The focal length of a lens is determined by its refractive index n and the radii of curvature R1 and R2 of its surfaces. The ...

https://en.wikipedia.org/wiki/Index_of_refraction

There are also lens adapters that allow a lens for one lens mounts to be used on a camera body with a different lens mount but ... Interchangeable lenses[edit]. Main articles: Photographic lens and Lenses for SLR and DSLR cameras ... Fixed or interchangeable lenses[edit]. Unlike DSLRs, most digital cameras lack the option to change the lens. Instead, most ... Like SLRs, DSLRs typically use interchangeable lenses (1) with a proprietary lens mount. A movable mechanical mirror system (2) ...

https://en.wikipedia.org/wiki/DSLR_camera

Shape of faceplate or lenses[edit]. Several shapes have been used for faceplates and lenses:[citation needed] ... A full-face mask consists of a transparent faceplate (lenses, or window) through which the diver can see, a connection to a ... There is usually a strong plastic frame which supports the faceplate (or lenses) and a demand valve, but in some cases the ... In some old masks, largely for industrial use out of water, small separate lenses above a rounded opaque nose-and-mouth mask, ...

https://en.wikipedia.org/wiki/Full_face_diving_mask

Zuiko lenses specifications[4] Lens Angle of view Elements - Groups Diaphragm Aperture range Closest focus Smallest field ... Prototype lenses[edit]. Manual Zuiko lenses that were never marketed: *18 mm/f3.5, prototype of 18 mm/f3.5, L.zuiko with 12 ... The Olympus OM System (O = Olympus, M = Maitani) was a line of 35mm single-lens reflex cameras, lenses and accessories sold by ... The OM Series lenses had the aperture control ring located at the front of the lens barrel. This was done to move it away from ...

https://en.wikipedia.org/wiki/Olympus_OM_system

Lenses[edit]. Optometrists can supply colored spectacle lenses or a single red-tint contact lens to wear on the non-dominant ... A 1981 review of various studies to evaluate the effect of the X-chrom contact lens concluded that, while the lens may allow ... Siegel, I. M. (1981). "The X-Chrom lens. On seeing red". Surv Ophthalmol. 25 (5): 312-24. doi:10.1016/S0039-6257(81)80001-X. ... Lenses that filter certain wavelengths of light can allow people with a cone anomaly, but not dichromacy, to see better ...

https://en.wikipedia.org/wiki/Colour-blindness

Observational astronomy uses lensing effects as an important tool to infer properties of the lensing object. Even in cases ... In particular, gravitational lensing provides one way to measure the distribution of dark matter, which does not give off light ... Introductions to gravitational lensing and its applications can be found on the webpages Newbury 1997 and Lochner 2007. ... Newbury, Pete (1997), Gravitational lensing webpages, archived from the original on 2012-12-06, retrieved 2007-06-12. ...

https://en.wikipedia.org/wiki/Introduction_to_general_relativity

The queer lens[edit]. Sedgwick aimed to make readers more alert to the "potential queer nuances" of literature, encouraging the ...

https://en.wikipedia.org/wiki/Eve_Kosofsky_Sedgwick

Gravitational lensing[edit]. One of the most important tests is gravitational lensing. It has been observed in distant ... Gravitational lensing[edit]. Astronomers using the Hubble Space Telescope and the Very Large Telescope have made precise tests ... In January 2012, LARES satellite was launched on a Vega rocket[68] to measure Lense-Thirring effect with an accuracy of about 1 ... The nearby galaxy ESO 325-G004 acts as a strong gravitational lens, distorting light from a distant galaxy behind it to create ...

https://en.wikipedia.org/wiki/Tests_of_general_relativity

Contact lenses[edit]. Different types of contact lenses may be used to delay or eliminate the need for corneal transplantation ... In corneal disorders where vision correction is not possible by using contact lenses, intrastromal corneal ring segments may be ... with an artificial lens installed in the transplanted piece. ... adequately correct their vision with glasses or contact lenses ...

https://en.wikipedia.org/wiki/Keratoplasty

"Plastic" (polycarbonate) lenses can become cloudy and discoloured. This is due to oxidation of the painted-on lens hardcoat by ... This may be achieved by methods including adhering opaque decals or prismatic lenses to a designated part of the lens. Some ... lens, or reflector, or a yellow filter between the bulb and the lens.[63] Filtration losses reduced the emitted light intensity ... Lens optics[edit]. A light source (filament or arc) is placed at or near the focus of a reflector, which may be parabolic or of ...

https://en.wikipedia.org/wiki/Laser_lamp

Lens types[edit]. Orthokeratology lenses are made by a number of companies and all use special gas-permeable contact lenses to ... "Orthokeratology , Ortho-K lenses , Myopic degeneration prevention". 2018-07-04.. *^ Orthokeratology contact lenses cause ... Rigid lenses are generally considered to be not as comfortable as soft lenses, but Ortho-K is claimed to avoid the feeling ... When Ortho-K lenses are worn, the eyes are closed for sleep, although the same issues that accompany wearing contact lenses ...

https://en.wikipedia.org/wiki/Orthokeratology

Gravitational lensing[edit]. The second type of B-modes was discovered in 2013 using the South Pole Telescope with help from ... Lewis, A.; Challinor, A. (2006). "Weak gravitational lensing of the CMB". Physics Reports. 429: 1-65. arXiv:astro-ph/0601594 . ... Instead they can be created by two mechanisms: the first one is by gravitational lensing of E-modes, which has been measured by ... This artist's impression shows how light from the early universe is deflected by the gravitational lensing effect of massive ...

https://en.wikipedia.org/wiki/Cosmic_Microwave_Background_Radiation

Main article: Close-up lens. A close-up lens is not technically a filter but accessory lens which attaches to a lens like a ... The filter diameter for a particular lens is commonly identified on the lens face by the ⌀ symbol. For example, a lens marking ... A few lenses, such as some of Canon's L series lenses, require the use of a filter to complete their weather sealing.[6][7][8] ... A close-up lens is a single or two-element converging lens used for close-up and macro photography, and works in the same way ...

https://en.wikipedia.org/wiki/Photographic_filter

Lens[edit]. Alpha crystallin (α4- crystallin) or hspb4 is involved in the development of lens in Zebrafish as it is expressed ... Expression of the hspb4 gene, which codes for alpha crystallin, increases considerably in the lens in response to heat shock.[ ... hspb1 (HSP27) is expressed during stress and during the development of embryo, somites, mid-hindbrain, heart and lens in ...

https://en.wikipedia.org/wiki/Heat_shock_protein

This led him to propose the use of artificial lenses made of Perspex in the eye, to treat cataract. He had a lens manufactured ... The first US Food and Drug Administration (FDA) approved lenses, (Choyce Mark VIII and Choyce Mark IX Anterior Chamber lenses) ... although it was not until 8 February 1950 that he left an artificial lens permanently in place in an eye. The first lens was ... was an English ophthalmologist who invented the intraocular lens and pioneered intraocular lens surgery for cataract patients.[ ...

https://en.wikipedia.org/wiki/Harold_Ridley_

Corrective lenses for myopia have negative powers because a divergent lens is required to move the far point of focus out to ... Strongly near-sighted wearers of contact lenses do not experience these distortions because the lens moves with the cornea, ... contact lenses, or surgery.[1] Eyeglasses are the easiest and safest method of correction.[1] Contact lenses can provide a ... of the crystalline lens as a result of sorbitol accumulating in the lens. This edema often causes temporary myopia. ...

https://en.wikipedia.org/wiki/Myopia

Scratch-resistant lenses[edit]. A sunglasses manufacturer called Foster Grant first licensed a NASA technology for scratch- ... resistant lenses, developed for protecting space equipment from scratching in space, especially helmet visors.[12] ...

https://en.wikipedia.org/wiki/NASA_spin-off_technologies

Contact lens solution[edit]. A contact lens solution containing polyaminopropyl biguanide in combination with a borate buffer ... "Comparative study of the microbial flora on contact lenses, in lens cases, and in maintenance liquids". Contact Lens and ... is a disinfectant and a preservative used for disinfection on skin and in cleaning solutions for contact lenses.[citation ... and fungicidal activity at low concentrations coupled with very low toxicity when used with soft-type contact lenses.[4] ...

https://en.wikipedia.org/wiki/Polyaminopropyl_biguanide

The largest lens opening (smallest f-number) at which the lens can be set. A fast lens transmits more light and has a larger ... The CS-mount description applies to both lenses and cameras. CS-mount lens cannot be put on C-mount cameras. C-mount lenses can ... Lens Speed[edit]. The ability of a lens to transmit light, represented as the ratio of the focal length to the diameter of the ... Focal Length (of a lens)[edit]. The distance from the focal point to the principal point of the lens. The focal length is ...

https://en.wikipedia.org/wiki/Glossary_of_video_terms

... is also used in some contact lens solutions.[71] Derivatives. *Taurine is used in the preparation of the anthelmintic ... In cosmetics and contact lens solutions. Since the 2000s cosmetic compositions containing taurine have been introduced, ...

https://en.wikipedia.org/wiki/Taurine

During frost heave, one or more soil-free ice lenses grow, and their growth displaces the soil above them. These lenses grow by ... This effect allows water to percolate through the soil towards the ice lens, allowing the lens to grow. ... Yet the force of one or more growing ice lenses is sufficient to lift a layer of soil, as much as 1 foot (0.30 metres) or more ... Another water-transport effect is the preservation of a few molecular layers of liquid water on the surface of the ice lens, ...

https://en.wikipedia.org/wiki/Frost_heaving

Types of lenses and screens[edit]. Spherical[edit]. Most motion picture lenses are of the spherical variety. Spherical lenses ... A special anamorphic lens is used on the camera to compress the image, and a corresponding lens on the projector to expand the ... Projector lenses differ in aperture and focal length to suit different needs. Different lenses are used for different aspect ... the spherical lens is the most common and versatile projection lens type. ...

https://en.wikipedia.org/wiki/Movie_projector

Contact lenses[edit]. The early stages of pellucid marginal degeneration may also be managed with soft contact lenses.[2] ... Most of these lenses are in the range of 15.5mm to 18.0mm in diameter. Regardless of the lens size, it is thought that the ... New studies found that the use of Scleral contact lens, a type of rigid gas permeable (RGP) lens, may be a good option for most ... and at times more comfortable than soft lenses, regardless of the fact that it is a rigid lens. The highlight to the scleral ...

https://en.wikipedia.org/wiki/Pellucid_marginal_degeneration

The beacon itself has operated with a hyper-radiant Fresnel lens (larger than 1st order) since 1908, with a focal plane of 86 ... Fresnel lens, making it one of the largest optics used in Portuguese lighthouses and one of the 10 largest in the world. It ...

https://en.wikipedia.org/wiki/Lighthouse_of_Cabo_de_São_Vicente

Corrective lenses can be produced in many different shapes from a circular lens called a lens blank. Lens blanks are cut to fit ... "BluTech Lenses - Technology, The story behind BluTech Lenses". BluTech Lenses.. *^ "Expert Healthy Vision & Eye Care Tips, News ... Higher power lenses can cause distortion of peripheral vision and may become thick and heavy if a large lens shape is used. ... For example, sunlenses could be easily lifted up and down while mixed with myopia lenses that always stay on. Presbyopia lenses ...

https://en.wikipedia.org/wiki/Spectacles

"two lenses"). שמיים‎ shamáyim ("sky"). מספריים‎ misparáyim ("scissors"). Khoe languages[edit]. In Nama, nouns have three ...

https://en.wikipedia.org/wiki/Dual_grammatical_number

Lens culinaris. Motor mah. Pea. Pisum sativum. Dhoa mogu. White lentil. Vigna mungo. ...

https://en.wikipedia.org/wiki/List_of_vegetables_in_Assam

optical lenses. *a program for Los Alamos National Laboratory. *tables for LORAN navigation ...

https://en.wikipedia.org/wiki/SEAC_(computer)

Contact lenses. Use in whole grain breads[edit]. Agricultural Research Service scientists are investigating using the plant- ...

https://en.wikipedia.org/wiki/Hypromellose

... are a clouding of the lens of the eye, causing blurry vision. They are a common and even normal part of aging, but ... The lens of your eye consists mostly of protein and water. The lens is located behind your pupil and iris (the black and ... The proteins in your lens are arranged in a way that keeps the lens clear. But due to normal changes that occur with age, these ... Surgery to replace the lens in your eye with an artificial lens is the only way to remedy a cataract. But its rarely necessary ...

https://www.everydayhealth.com/cataracts/guide/

Brian Boxer Wachler says refractive lens exchange or clear lens extraction may be better than LASIK for presbyopia and ... Contact Lenses * Soft Contacts Featured. Contact Lens Basics Reading a Contact Lens Prescription Soft Contact Lens Care View ... Eyeglass Lenses Featured. How to Choose Eyeglass Lenses Anti-reflective Lenses Progressive Lenses View all ... Refractive lens exchange, also called lens replacement surgery or clear lens extraction, may be a better option than LASIK, PRK ...

https://www.allaboutvision.com/visionsurgery/refractive-lens-exchange.htm

Get a Halloween-themed social media graphic about contact lens emergency supplies. ... Keep a close eye on your #emergency supplies & avoid a nightmare eye infection! If you wear contact lenses, #PrepYourHealth ... with a contact lens case, disinfecting solution, & a backup pair of glasses: http://ow.ly/rU4a30pJheIexternal icon # ...

https://www.cdc.gov/cpr/socialmedia/cyclops.htm

Healthy and Safe Contact Lens Cleaning and Use. Millions of people use contact lenses every day but lens cleaning practices can ... Hands should be washed before handling contact lenses and contacts should be properly cleaned, disinfected, and stored to ... Following your eye doctors recommendations and a few simple steps can lead to healthy daily contact lens use. ... Contact Lens, Lens Care Systems, & Solution Typesplus icon *Contact Lens Types ...

https://www.cdc.gov/contactlenses/announcements.html

KODAK Eyeglass Lenses gives you the power to see the colors of life in crystal clear vision so you can explore to your hearts ... manufactures and sells the above eyeglass lenses. The Kodak trademark, logo and trade dress are used under license by Signet ...

https://www.kodak.com/tr/tr/Consumer/Products/Eyeglass_Lenses/default.htm

When this happens, people wear glasses or contact lenses. Find out more in this article for kids. ... But eyeglasses or contact lenses, also called corrective lenses, can help most people see more clearly. ... Glasses or contact lenses correct vision because they allow the eye to focus light in the right spot on the retina - the spot ... Glasses or contact lenses work so well because they can correct refractive problems. In other words, they bend the light rays ...

http://kidshealth.org/Demo29/en/kids/glasses.html

ZEISS Lens Gears make ZEISS Otus, ZEISS Milvus and ZEISS Loxia lenses a proper cine-style lens for professional filmmakers. The ... This means the inner diameter can be reduced according to the lens diameter, thus supporting multiple lenses. The GumGum also ... ZEISS Loxia lenses are suitable for digital Sony Alpha cameras and have been optimized for film and sensors up to full 35 mm ... The lenses offer a high resolution across the entire image field and - especially at the maximal aperture opening of f/2 - a ...

https://www.zeiss.com/consumer-products/int/photography/videography/loxia-lenses.html

https://www.imaging-resource.com/lenses/sigma/reviews/

Progressive Lens solutions Whatever our eyes need in todays world - ZEISS provides the right progressive lenses solution. ... In addition, we are proud to offer a complete portfolio of ZEISS-branded stock lenses. These lenses come in a large assortment ... All freeform products by Carl Zeiss Vision, including ZEISS lenses. *Semi-finished lenses, such as GT2 by ZEISS, Flat Top 28, ... Having the option to finish lenses in-house can be an important factor in remaining competitive. ZEISS stock lenses meet your ...

https://www.zeiss.com/vision-care/us/for-eye-care-professionals/eyeglass-lens-products/eyeglass-lenses/stock-lenses.html

The AF-S NIKKOR 28mm f/1.4E ED is the latest in the Gold Ring Series of f/1.4 prime lenses. It has a fast f/1.4 maximum ... giving photographers and filmmakers an FX-format lens with the look and feel of a circular fisheye and the versatility of a ...

https://www.nikonusa.com/en/nikon-products/marketing/updates/camera-lenses/index.page

... implantable lens that can help even the most nearsighted patients. The images show a surgeon implanting the lens through a 3 ... The Verisyse lens corrects moderate to high nearsightedness. A surgeon positions it over the pupil between \[…\] ... The Verisyse lens, made my Advanced Medical Optics, is racing STAAR Surgical neck and neck for the first FDA approval of a ... Slideshow: Permanent Lenses in Sight. credit Image courtesy STAAR Surgical. FDA approval is imminent for a permanent, ...

https://www.wired.com/2004/10/64803/

This report analyzes the worldwide markets for Contact Lenses and Solutions in US$ Million by the following Segments:... ... Daily Wear Lenses Daily Wear Hard Lens Daily Wear Soft Lens Daily Wear Hard Gas-Permeable Lens Extended Wear Lenses Soft Lenses ... Contact Lenses Rigid Gas-Permeable Lenses Soft Contact Lenses Spherical Lenses Toric Lenses Multifocals Hybrid Contact Lenses ... Hard Lenses PMMA Lenses Rigid Gas-Permeable Lenses Advantages Disadvantages Soft Lenses Description Spherical Soft Lenses ...

https://www.prnewswire.com/news-releases/global-contact-lenses-and-solutions-industry-300824986.html

Lens photography starts with choosing the right camera lens and knowing that different focal lengths, from wide-angle to ... Nifty fifty lenses. Nifty fifty is a nickname for a 50mm lens that has a wide aperture. The lens elements on a nifty fifty are ... Lenses that come with cameras.. Camera bodies are often sold in combination with a lens. These are called kit lenses. They are ... How to choose a lens.. The right lens for you depends on what type of photography you want to shoot. And your lens decision ...

https://www.adobe.com/creativecloud/photography/discover/lens-photography.html

"Coloured Contact Lenses". lenses-contact.co.uk.. *^ "How Do You Find the Right Circle Lens?". EyeCandys. Retrieved 26 March ... "Soft Contact Lens Care Products".. *^ www.feelgoodcontacts.com. "Caring For Contact Lenses - Feel Good Contact Lenses". www. ... the FDA labels non-corrective cosmetic contact lenses as decorative contact lenses. Like any contact lens, cosmetic lenses ... "International Contact Lens Prescribing in 2010". Contact Lens Spectrum. October 2011. *^ Agarwal, R. K. (1969), Contact Lens ...

https://en.wikipedia.org/wiki/Colored_contact_lenses

A camera lens (also known as photographic lens or photographic objective) is an optical lens or assembly of lenses used in ... Lens mounts[edit]. Main article: Lens mount. Many single-lens reflex cameras and some rangefinder cameras have detachable ... Lenses for aerial photography.. *Fisheye lenses: extreme wide-angle lenses with an angle of view of up to 180 degrees or more, ... Today, most lenses are multi-coated in order to minimize lens flare and other unwanted effects. Some lenses have a UV coating ...

https://en.wikipedia.org/wiki/Camera_lens

Lens hood (ALC-SH134: petal shape, bayonet type), Lens front cap, Lens rear cap, Case ... The lens combines five aspherical elements (including one AA - advanced aspherical lens), with 3 ED (Extra-low Dispersion) ... A 16mm to 35mm wide-angle zoom range coupled with effective built-in optical image stabilization makes this lens an excellent ... Reliable operation in a variety of conditions is ensured by a design that prevents dust and moisture from entering the lens. ...

https://www.sony.com/en-tn/electronics/camera-lenses/sel1635z

A lever and ring on the lens barrel allow zoom speed to be freely adjusted as required while maintaining a sure, stable grip. ... This G Lens for E-mount cameras delivers stunning still or movie imagery with the flexibility of 6x power zoom. Maximum ... Lens hood (ALC-SH128: petal shape, bayonet type), Lens front cap, Lens rear cap ... One lens for diverse shooting needs. Having to change lenses as you shoot can slow you down and introduce unwanted changes in ...

https://www.sony.com/en-iq/electronics/camera-lenses/selp18105g

... prime lens features a large F1.8 maximum aperture and is capable of outstanding sharpness and contrast throughout the frame ... Lens hood (ALC-SH114: petal shape, bayonet type), Lens front cap, Lens rear cap, Case ... Spectacular ZEISS prime lens performance. This first-class 24mm (35mm full frame equivalent) prime lens features a large F1.8 ... With a 16-cm minimum focusing distance this lens makes it possible to get close to your subject in 1:4 macro shots that show ...

https://www.sony.com/tz/electronics/camera-lenses/sel24f18z

... which are world renowned LEICA Quality Lenses developed and manufactured by industry-leading technologies. ... Learn more about our revolutionary Lumix G Lenses, ... LUMIX Camera Lenses Video Cameras Camera Accessories Home ... Micro Four Thirds Interchangeable Lens, Standard Zoom, POWER O.I.S., Dual I.S.2 Compatible, High-Speed AF, Rugged Design. ... Micro Four Thirds 25mm Fixed Focal Length Lens / 50mm (35mm camera equiv.) High-Speed AF, Rugged Design. ...

https://www.panasonic.com/au/consumer/lumix-cameras-video-cameras/lumix-camera-lenses/lumix-g-lenses.html

... Articles OnContact Lenses. Contact Lenses Contact Lenses - Contact Lenses and Eye Infections ... Slideshow: Contact Lens Tips Contact lenses are a convenient and comfortable alternative to eyeglasses for many people. But you ... Make sure you clean and disinfect your lenses and lens case correctly, and dont keep either longer than you should. ... Dont throw your lenses away. Put them in the case, and bring them when you see your eye doctor. They may give him or her a ...

https://www.webmd.com/eye-health/contact-lenses-eye-infections

Thinner, flatter lenses are recommended when a prescription is strong. Flatter lenses enhance lens appearance by reducing edge ... Some materials, such as Phoenix lenses, high-index lenses and several new plastic lens types come standard with scratch ... Tinted lenses can be tinted from light to very dark. Tints for sun lenses are usually medium to dark shades, and can either be ... Lens Treatments. Photochromic lenses darken and lighten according to light exposure. If the wearer is in the sun, they get ...

https://www.hopkinsmedicine.org/wilmer/services/optical/lenses.html

With a large lens, we have more room for error around the edges as we refine our procedure. We used this lens positive to make ... We have concluded that the best way to produce a lens using epoxy resin is to 3D print the lens positive, wrap it in plastic ... We 3D printed a "lens positive", a piece of opaque plastic in the shape of our desired lens. This time we were careful to print ... The ability to simply print out a lens without intermediate steps would be enormously useful in bringing down the costs of lens ...

http://www.princeton.edu/ssp/joseph-henry-project/3d-lens/

Get the best deals on Camera Lenses & Filters when you shop the largest online selection at eBay.com. Free shipping on many ... What are camera lens filters for?. Lens filters are used for protecting the front element of a lens. They are used for outdoor ... Zeiss 21mm F2.8 Distagon T* ZE Lens 21/2.8 Canon EF With Lens Hood. $588.00 ... A filter adapter ring is a device that is used when a filter is being used on a lens with a larger or smaller thread size. The ...

https://www.ebay.com/b/Camera-Lenses-Filters/78997/bn_152392

POWER O.I.S. : Micro Four Thirds Lenses, Standard Zoom Lens ... Lumix G Lenses. LUMIX G X VARIO 12-35mm / F2.8 ASPH. / ... UED (Ultra Extra-Low Dispersion) Lens. UED (Ultra Extra-Low Dispersion) lens minimize chromatic aberration while the UHR (Ultra ... Micro Four Thirds 12-35mm Standard Zoom Lens / 24-70mm (35mm camera equiv.) ... by applying the extra-low refractive index coating with nano-sized structure on the surface of the lens. It results in super ...

https://www.panasonic.com/sg/consumer/cameras-camcorder/lumix-g-lenses/h-hs12035.html

At first the lenses will be powered by a tiny thin-film, solid-state battery within the lens. Sinclair says the battery is ... Lenses for consumers, eventually. Only after Mojo has begun marketing its vision assistance and vertical market lenses does it ... "Weve tested pretty much everything outside the lens, and now its all getting pulled together in the lens," says Sinclair. ... the normal loss of ability to focus the lens of the eye on small objects that comes with aging. The Mojo lenses, for example, ...

https://www.fastcompany.com/90441928/the-making-of-mojo-ar-contact-lenses-that-give-your-eyes-superpowers?partner=rss&utm_source=twitter.com&utm_medium=social&utm_campaign=rss+fastcompany&utm_content=rss

... allowing for seven new lenses to be added to the video line-up. ... announced a new firmware upgrade for its Lumix G series lenses ... The lenses that can be added to the video line-up now include the 14mm pancake lens, the 8mm fisheye lens and the 45-200mm zoom ... Panasonic has announced a new firmware upgrade for its Lumix G series lenses, allowing for seven new lenses to be added to the ... and means the following lenses can now be considered as part of the HD Lenses of Lumix G Micro System line-up:. Lumix G 14mm f/ ...

https://www.techradar.com/uk/news/photography-video-capture/cameras/panasonic-lenses-firmware-upgrade-announced-1025465

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https://www.walgreens.com/q/specialty+contact+lenses

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https://www.walgreens.com/store/store/category/sub_category_contact_lens.jsp?catId=310767&navAction=pop&navCount=0

But now, doctors are implanting lenses that can correct these things and more. ...

https://www.mayoclinic.org/tests-procedures/cataract-surgery/multimedia/vid-20078193

Lenses. Sony Lens Cameras QX10 and QX100 manuals leak in hardware detail. Chris Burns , Aug 16, 2013 ... Sigma has unveiled a handful of new lenses that will join the companys current lineup of Art lenses, which are designed to be ... In late January, Sigma unveiled several new lenses in the companys Art line. When the company announced those new lenses in ... The four new lenses that Sigma announce are a 30mm f/1.4 DC HSM, 60mm f/2.8 DN, 30mm f/2.8 DN, and a 19mm f/2.8 DN. ...

https://www.slashgear.com/tags/lenses/page/7/

Nifty fifty is a nickname for a 50mm lens that has a wide aperture . (adobe.com)
Micro Four Thirds 25mm Fixed Focal Length Lens / 50mm (35mm camera equiv. (panasonic.com)
Micro Four Thirds 10-25mm Standard Zoom Lens / 20-50mm (35mm camera equiv. (panasonic.com)
Learn about topics such as How to Repair Lens Problems on Your Digital Camera , How to Shoot with a 50mm Lens , How to Clean a Camera Lens , and more with our helpful step-by-step instructions with photos and videos. (wikihow.com)
With a standard 50mm focal length on full-frame cameras, this is an unbeatable choice for photographers who love to work with prime lenses, and a perfect starting point for a superb ZEISS lens collection. (sony.co.uk)

Refractive lens exchange (RLE) replaces your eye's clear natural lens with an artificial intraocular lens (IOL) to correct your refractive error and achieve sharper focus, reducing your need for reading glasses or bifocals . (allaboutvision.com)
Non-surgical options for presbyopia include reading glasses, bifocal or progressive lenses , and multifocal contact lenses . (allaboutvision.com)
Presbyopia historically has been corrected with prescription glasses with bifocal or progressive lenses or by reading glasses. (nationalpost.com)
It is often managed with prescription glasses with bifocal or progressive lenses or by reading glasses over contact lenses. (nationalpost.com)
Alcon Dailies Total1 ® contact lenses, are single-use multifocal lenses that became available in Canada last year, giving patients with presbyopia a comfortable alternative to burdensome reading glasses. (nationalpost.com)

The Moment Wide 18mm Lens is a stunning aspheric lens for your iPhone camera that delivers exceptional edge-to-edge image quality. (apple.com)
He explains that, with Alcon Dailies Total1 ® multifocal contact lenses, the near-vision correction is addressed at the centre of the lens and that its aspheric design means that the power gradually blends toward the distance. (nationalpost.com)
Aspheric lenses are also useful for high prescriptions. (encyclopedia.com)
Manufacture of integrated lens arrays, microlens arrays, aspheric lenses and condenser lenses by glass molding. (photonics.com)

THURSDAY, Aug. 13, 2020 (HealthDay News) -- Kids suffering from nearsightedness can slow the progression of their myopia by using soft bifocal contact lenses , a new trial shows. (webmd.com)
High-powered bifocal contacts effectively slowed the progression of nearsightedness, while medium-powered bifocal contacts and single-focus lenses did not. (webmd.com)
The high-powered bifocal lenses also did not appear to hurt kids' vision, even though they were subjected to stronger reading power before they needed that level of correction, the researchers said. (webmd.com)
When testing kids' ability to read gray letters on a white background, there was a two-letter difference between children wearing single-vision lenses and those with bifocal contacts. (webmd.com)
Multifocal lenses improve both near and distant vision and are suitable for individuals who require bifocal eyeglasses. (walgreens.com)
Special therapeutic, bifocal and cosmetic contact lenses also are available. (mayoclinic.org)
Some patients may also use bifocal or multifocal lenses to correct both long sightedness and short sightedness. (news-medical.net)
They may have the option to wear bifocal contact lenses that are split into distant vision at eye level and near sight at the lower level. (news-medical.net)

People choose to wear contact lenses for many reasons. (wikipedia.org)
[6] Others wear contact lenses for functional or optical reasons. (wikipedia.org)
People who wear contact lenses have a higher risk for keratitis, an infection of the cornea , the clear outer covering of your eye . (webmd.com)
Many who wear contact lenses prefer the colored version for a variety of reasons, including the fact that they are easy to see when out of the eye. (emory.edu)
People allergic to certain plastics should not wear contact lenses or eyeglass frames or lenses manufactured from that type of plastic. (encyclopedia.com)
They can also be a factor in headaches for people who wear contact lenses if they are wearing the wrong prescription. (news-medical.net)
Should You Wear Contact Lenses for Astigmatism? (mercola.com)

The week of August 21-25, 2017 marks the fourth annual Contact Lens Health Week ! (cdc.gov)

Two SLD elements, one Glass Mold Aspherical plus two Hybrid Aspherical lenses provide excellent correction of various aberrations and a high level of optical performance. (dpreview.com)
Two SLD elements and four aspherical lenses provide the ultimate correction against distortion as well as all types of aberration, especially spherical aberration. (dpreview.com)
The use of aspherical lenses in the construction of this lens not only corrects aberrations but also produces a very small and lightweight lens design. (dpreview.com)

The lens is located behind your pupil and iris (the black and colored areas of your eye), which are covered by your cornea (the clear outer layer of your eye). (everydayhealth.com)
Contact lenses appear to be worn in direct contact with the cornea, but they actually float on a layer of tears that separates them from the cornea. (encyclopedia.com)
Scleral contact lenses can help people who don't respond to other treatments for their cornea conditions. (mayoclinic.org)
A fluid barrier keeps the scleral lens from touching the cornea. (mayoclinic.org)
The lack of contact between the back of the scleral lens and the cornea reduces pain, and the spherical front surface of the lens improves vision. (mayoclinic.org)
Scleral contact lenses cover the white part of the eye and arch over the cornea. (mayoclinic.org)
This is when light entering a person's eyes through the outer cornea of the eye and through the lens does not focus on the retina but either converges before or after the retina. (news-medical.net)
Wearers may use the contact lenses to help correct astigmatism which impairs clarity in vision due to an uneven eye lens or cornea. (news-medical.net)
contact lens Lens worn on the cornea to aid defective vision. (encyclopedia.com)
Hard (corneal) lenses cover the pupil and part of the cornea. (encyclopedia.com)
Soft (hydrophilic) lenses cover the whole cornea and are hydrated in saline solution. (encyclopedia.com)
A cylindrical lens can help you overcome the visual impairment of astigmatism, a condition in which the front surface of the cornea of the eye is not truly spherical. (innerbody.com)
They have a design feature that allows the lens to rotate and adjust to the proper orientation on the cornea, allowing the power meridians of the lens to align with the appropriate eye meridians, giving the wearer clear vision. (mercola.com)
Rigid gas permeable (RGP or GP) contact lenses - These lenses, as their name implies, are rigid, allowing them to retain their spherical shape on the eye, as opposed to conforming to the irregular shape of the cornea. (mercola.com)
Surgical ways include corneal procedures (i.e., laser surgery on the cornea, thermokeratoplasty, and implantation of corneal inlays) and intraocular procedures that include cataract surgery or refractive lens exchange with the implantation of multifocal intraocular lenses or monofocal lenses with refractive target monovision. (hindawi.com)

This means the inner diameter can be reduced according to the lens diameter, thus supporting multiple lenses. (zeiss.com)
While the overall length of the different Loxia lenses might vary, the front diameter is consistent for all three focal lengths in the family. (zeiss.com)
These lenses were made from heavy blown glass and were 18-21 mm (0.71-0.83 in) in diameter. (wikipedia.org)
We started by 3D printing molds for convex lenses 1 inch in diameter with a 10 cm focal length. (princeton.edu)
We aimed for a larger lens, 2 inches in diameter, because we had trouble working with the smaller lens earlier. (princeton.edu)
The intraocular lens is designed with specific flexibility characteristics so as to exhibit greater than approximately 1.0 mm axial displacement of the optic portion along the eye's optical axis under a compression force suitable to effect a 1.0 mm in diameter compression of the intraocular lens. (google.com.au)

Light and inconspicuous - the ZEISS Loxia Lenses are optimally suited to video recordings: their compact size enables the cameraman to work unobtrusively from various angles and thus avoid disrupting the scenery. (zeiss.com)
The ZEISS Loxia lenses are small, robust and made of metal. (zeiss.com)
A harmonious bokeh and the full-frame coverage are the ideal complements to the ZEISS Loxia lenses. (zeiss.com)
ZEISS Lens Gears make ZEISS Otus, ZEISS Milvus and ZEISS Loxia lenses a proper cine-style lens for professional filmmakers. (zeiss.com)
The ZEISS Lens Gears are available in four different sizes: mini, small, medium and large. (zeiss.com)
ZEISS Loxia lenses are suitable for digital Sony Alpha cameras and have been optimized for film and sensors up to full 35 mm format (24 x 36 mm). (zeiss.com)
With their reliable functions, camera lenses from ZEISS ensure that photographers can fully concentrate on the image and composition, and bring their creativity to life. (zeiss.com)
ZEISS grants a warranty period of two years from the date of purchase for all its photographic lenses. (zeiss.com)
ZEISS stock lenses meet your needs by combining industry-leading precision and quality with great value. (zeiss.com)
With same-day* order fulfillment and first-rate customer service, ZEISS stock and uncut lenses will meet your needs and those of your patients. (zeiss.com)
The entire ZEISS Rx portfolio is available as uncut lenses, providing you with the customized lenses your patient needs. (zeiss.com)
In addition, we are proud to offer a complete portfolio of ZEISS-branded stock lenses. (zeiss.com)
These lenses come in a large assortment of materials, treatments, and powers, giving you the ability to have ZEISS stock on hand in your office or to order on-demand. (zeiss.com)
ZEISS stock and uncut lenses are manufactured to meet the high quality standards you expect from ZEISS. (zeiss.com)
The ZEISS National Lab Network offers a wide selection of stock and uncut lenses. (zeiss.com)
With outstanding performance, the highest quality optics, and great value, ZEISS stock and uncut lenses meet the needs of every patient and practice. (zeiss.com)
For a detailed list of stock and uncut lens availability, please download the ZEISS Stock Lens Portfolio PDF. (zeiss.com)
ZEISS is one of the world's leading manufacturers of eyeglass lenses, and is committed to delivering maximum precision and comfort. (zeiss.com)
ZEISS designs and produces lenses, instruments and measurement systems, as well as retail concepts and technology services that continue to raise the bar in vision care. (zeiss.com)
This week the team at ZEISS have announced that they'll no longer be branding their lens family with the name of their founder. (slashgear.com)
ZEISS lenses are known for their superior sharpness, contrast, and well-defined blacks. (sony.co.uk)
The Master Anamorphic Lenses have been co-developed by ARRI and ZEISS, are manufactured by ZEISS, and are sold exclusively by ARRI. (arri.com)

Increasing awareness about the importance of proper contact lens hygiene can encourage wearers to adopt healthy habits that can help reduce their chances of getting an eye infection. (cdc.gov)
[3] As of 2010 [update] , the average age of contact lens wearers globally was 31 years old, and two-thirds of wearers were female. (wikipedia.org)
Contact lens wearers can also wear sunglasses, goggles, or other eyewear of their choice without having to fit them with prescription lenses or worry about compatibility with glasses. (wikipedia.org)
Contact lens wearers may suffer from headaches due to different factors. (news-medical.net)
Wearers have to make sure that the toric lens sits on the eye in a specific position. (news-medical.net)
Contact lens wearers can also suffer from dry eyes, also known as keratoconjunctivitis sicca, when not enough tears are made in the tear ducts. (news-medical.net)
Contact lens wearers can use eye drops to lubricate their eyes and alleviate the symptoms. (news-medical.net)
However, contact lens wearers are at risk for contact lens-related eye infections, especially when wearers do not practice proper contact lens wear and care habits. (medscape.com)
Health education measures directed toward contact lens wearers should emphasize raising awareness of the risks of sleeping in contact lenses as well as adherence to all recommendations for the wear and care of contact lenses. (medscape.com)
[ 2 ] Among the many behaviors that increase the risk for a contact lens-related corneal infection, sleeping in lenses is one of the riskiest and one of the most commonly reported behaviors among adolescent and adult contact lens wearers. (medscape.com)
[ 3 ] Approximately one third of contact lens wearers report sleeping or napping in their lenses. (medscape.com)
Contact lenses prescribed by a licensed doctor of optometry are worn safely and comfortably by millions of people worldwide and have a long history of providing wearers with a safe and effective form of vision correction. (aoa.org)

The lenses offer a high resolution across the entire image field and - especially at the maximal aperture opening of f/2 - a harmonious bokeh in the background. (zeiss.com)
Almost any lens in the mid-range with a wide aperture will allow you to take stylized portraits with a shallow depth of field. (adobe.com)
An 85mm is known as a portrait lens, and one with a wide aperture can capture that shallow depth of field and separation from the subject and background," says Diaz. (adobe.com)
As shown, a pinhole "lens" is simply a small aperture that blocks most rays of light, ideally selecting one ray to the object for each point on the image sensor. (wikipedia.org)
This first-class 24mm (35mm full frame equivalent) prime lens features a large F1.8 maximum aperture and is capable of outstanding sharpness and contrast throughout the frame plus beautiful "bokeh" in out-of-focus areas. (sony.com)
I often adjust the exposure for DOF, or to be where I want with the lens' aperture, but I don't have a lot of time to set up each shot. (cambridgeincolour.com)
They are the APO Macro 150 mm F2.8 EX DG HSM (a fast tele-macro lens with a Hyper Sonic Motor), the 24-70 mm F2.8 EX DG Macro (a useful 24 mm wide angle zoom with a large maximum aperture and macro capabilities) and the 28-70 mm F2.8 EX DG (a compact standard wide angle zoom with a large maximum aperture). (dpreview.com)
This large aperture telephoto macro lens enables you to shoot up to 1:1 life size close-ups. (dpreview.com)
Its large F2.8 aperture makes it an ideal lens for digital SLR as well as film SLR cameras. (dpreview.com)
From 24mm super wide angle to 70mm medium telephoto, this lens provides a large F2.8 aperture at all focal lengths. (dpreview.com)
This is the world's smallest, large and constant aperture zoom lens and is ideal for digital SLR cameras. (dpreview.com)
A unique feature of the Tair 11 series is the twenty aperture blades, far more than many modern lenses. (wikipedia.org)

The AF-S NIKKOR 28mm f/1.4E ED is the latest in the Gold Ring Series of f/1.4 prime lenses. (nikonusa.com)
Some lenses are "fixed" (also known as prime lenses) and have a single focal length, while others are "variable" (also known as zoom lenses) and can adjust to different focal lengths. (adobe.com)
The Master Anamorphic series, a range of nine high-performance prime lenses, represents a significant step forward in the technology and practicality of anamorphic cinematography for 35 format digital and film cameras. (arri.com)
Tair is the name of a series of prime lenses manufactured by KMZ in the Soviet Union. (wikipedia.org)

The artificial intraocular lens is a permanent replacement for your natural lens and is designed to last the rest of your life. (allaboutvision.com)
An accommodating intraocular lens including an optic portion having an outer peripheral edge and two, three or four balanced haptic elements for use to achieve multifocal refractive correction. (google.com.au)
2. The intraocular lens of claim 1 wherein the haptic elements and the optic portion are both formed of a foldable or compressible material. (google.com.au)
3. The intraocular lens of claim 1 wherein said lens is formed from a material selected from the group consisting of silicone polymers, hydrocarbon and fluorocarbon polymers, hydrogels, soft acrylic polymers, polyester, polyamides, polyurethane, silicone polymers with hydrophilic monomer units, fluorine-containing polysiloxane elastomers and combinations thereof. (google.com.au)
4. The intraocular lens of claim 1 wherein said lens is formed from a hydrogel material. (google.com.au)
5. The intraocular lens of claim 1 wherein said lens is formed from a hydrogel material which is 18 percent by weight water. (google.com.au)
6. The intraocular lens of claim 1 wherein said lens is formed from poly(HEMA- co -HOHEXMA). (google.com.au)
7. The intraocular lens of claim 1 wherein said lens is formed from a material having a refractive index above 1.33. (google.com.au)
10. The intraocular lens of claim 1 wherein said haptic elements are formed with a dimension in a plane generally perpendicular to the eye's optical axis to be greater than or equal to a dimension in a plane generally parallel to the eye's optical axis. (google.com.au)
11. The intraocular lens of claim 1 wherein a glare reduction zone is formed adjacent to the outer peripheral edge of the optic portion. (google.com.au)
12. The intraocular lens of claim 1 wherein one or more of said haptic elements includes a stiffening element having less resistance to bending in a plane generally parallel to the eye's optical axis than in a plane generally perpendicular to the eye's optical axis. (google.com.au)
13. The intraocular lens of claim 1 wherein one or more of said haptic elements includes a stiffening element formed from a material selected from the group consisting of polyimide, polyolefin, high-density polyester, nylon and metal. (google.com.au)
In the attempt to manage presbyopia, different intraocular lens designs have been proposed such as monofocal IOLs with monovision or multifocal IOLs. (hindawi.com)
It has been attributed to several factors such as the pupil size, total and corneal aberrations, degrees and axis of astigmatism, potential of visual perception, and axial movement of the intraocular lens. (hindawi.com)

Whether you use film cameras, DSLR cameras, or mirrorless cameras, you will encounter a similar range of available focal lengths in your lenses. (adobe.com)
The lens combines five aspherical elements (including one AA - advanced aspherical lens), with 3 ED (Extra-low Dispersion) glass elements to deliver high-precision shots and breathtaking rendering - without the bulky design usually associated with similar DSLR lenses. (sony.com)
Ensure that your DSLR camera produces the sharpest autofocus photos possible by calibrating your lens. (adobe.com)
However, in a DSLR camera , an autofocused image requires clear communication between the lens (which lets in the light), the camera's autofocus chip (which determines when the image is in focus) and the camera's sensor (which creates the image). (adobe.com)
I wish to convert to a decent DSLR and at present own a Pentax SFXn camera with numerous lenses. (ephotozine.com)
Do you have a camera dealer close to you where you can take a couple of your lenses along and try them on a Pentax dSLR body. (ephotozine.com)
I only have one DSLR right now so the bridge camera serves as my wide angle lens. (cambridgeincolour.com)
It's the whole reason why you buy a dslr, for the ability to change out the lenses to best suit the dynamics of the image. (cambridgeincolour.com)
Without a doubt the cameras which created the most 'buzz' in 2009 were the Olympus E-P1 and Panasonic GF1 - the first in a new breed of interchangeable-lens compacts that promise the image quality of a DSLR in a much more portable package. (dpreview.com)

Interchangeable camera lenses. (adobe.com)
But if you dip your toe into more advanced photography, you will likely work with a camera that has an interchangeable lens system. (adobe.com)
Each interchangeable lens has a different focal length , which is good for different types of photography projects. (adobe.com)
A lens might be permanently fixed to a camera, or it might be interchangeable with lenses of different focal lengths , apertures , and other properties. (wikipedia.org)
Fujifilm has announced more details about upcoming accessories that will be available for the newly released interchangeable lens camera, the X Pro 1. (techradar.com)
The X Pro 1 is Fuji's first interchangeable lens camera since 2006 and features an APS-C sized sensor which thanks to technology drawn from the firm's analogue heritage is apparently capable of out resolving a full-frame sensor. (techradar.com)
In this buying guide we've rounded up all the current interchangeable lens cameras costing over $2500 and recommended the best. (dpreview.com)
Prescriptions for contact lenses and glasses may be similar but are not interchangeable. (aoa.org)
The Samsung NX10, another entry in the growing compact interchangeable-lens camera category, takes up less room in your camera bag than most DSLRs, while still featuring a 14.6 megapixel, APS-C, CMOS image sensor, 3-inch LCD, and the Samsung NX mount for interchangeable lenses. (macworld.com)

Learn how to choose the right camera lens for your photography projects and how different focal lengths - from wide angle to telephoto - affect your images. (adobe.com)
The lower the focal length of your lens, the wider its field of view - shorter focal lengths capture more wide-angle scenes. (adobe.com)
Then you're going to need a wide-angle lens to fit everything in. (adobe.com)
At the low end of the focal range spectrum are wide-angle lenses , typically 12mm to 35mm. (adobe.com)
If you shoot landscapes, a variable wide-angle lens would support that type of photography," says photographer Pablo Diaz. (adobe.com)
Wide-angle lenses - great for landscape photography, architecture photography, and photos of the sky or the Milky Way. (adobe.com)
A 16mm to 35mm wide-angle zoom range coupled with effective built-in optical image stabilization makes this lens an excellent choice for snapshots, indoor scenes, group shots, landscapes, and more, especially with a full-frame α7 series body. (sony.com)
With a 16-cm minimum focusing distance this lens makes it possible to get close to your subject in 1:4 macro shots that show detail with impressive wide-angle perspective. (sony.com)
photography ) A wide-angle lens having an extremely wide field of view (approaching or exceeding 180 degrees) and producing images that are circular or distorted by curvature at the edges. (wiktionary.org)
It's a perfect, everyday, go-to wide-angle lens for your mobile photography and filmmaking. (apple.com)
If you're taking a close-up portrait, you might use a wide-angle lens . (howstuffworks.com)
Through phone cases for the most popular brands, or a special clip for the others, you can now use their lenses (the macro, fisheye, wide-angle and telephoto) with any phone. (digital-photography-school.com)
The first includes a macro, wide-angle and fish-eye lens. (digital-photography-school.com)
If you decide you want to get a little further away the wide-angle lens is what you need. (digital-photography-school.com)
The wide-angle lens will let you take photos at any distance. (digital-photography-school.com)
The Struman wide-angle lens was attached to the phone and now you can see that there is a lot more room around the lighthouse. (digital-photography-school.com)
Same Lighthouse, but with the wide-angle lens attached. (digital-photography-school.com)
If you find that you don't want to get as close as you have to with the macro lens, put the wide-angle on and you can get that distance. (digital-photography-school.com)

An optician makes or sells eyeglasses and contact lenses according to an ophthalmologist's or optometrist's prescription. (kidshealth.org)
Patients who develop presbyopia will need to see their optician to get a new prescription for their contact lenses to help correct the condition. (news-medical.net)
The patient will need to explore a better fitting toric lens with their optician. (news-medical.net)

Bifocals provide both distance and near vision correction in one lens. (hopkinsmedicine.org)
Contact lenses allow you to enjoy the benefits of clear vision without having to wear prescription eyeglasses and can simplify vision correction. (walgreens.com)
Contact lenses offer numerous benefits for those who are in need of vision correction. (walgreens.com)
The greater the index of refraction of the lens material and the greater the difference in the curvature between the two surfaces of the lens, the greater the change in direction of light that passes through it, and the greater the correction. (encyclopedia.com)
Lenses can be unifocal, with one correction for all distances, or they can be correct for more than one distance (multifocal). (encyclopedia.com)
however, lenses where the correction gradually changes from one area to the other, without visible lines, have been available since the 1970s. (encyclopedia.com)
The ability of the lens to adjust from a distant to a near focus, called accommodation, gradually declines with age (a condition called presbyopia), often requiring correction. (britannica.com)
The new lens power layout provides the ultimate correction against lateral chromatic aberration to which digital cameras are prone. (dpreview.com)
Contact lenses, when worn and cared for properly, are a safe and effective form of vision correction used by an estimated 45 million Americans. (medscape.com)
More particularly, the present invention relates to accommodating IOLs designed for refractive correction in aphakic eyes where a diseased natural lens is surgically removed, such as in the case of cataracts. (google.com.au)
Safe contact lenses use provides an effective form of vision correction. (aoa.org)

The Verisyse lens corrects moderate to high nearsightedness. (wired.com)
Olloclip is one company that offers these types of lenses, and they've come out with an accompanying iPhone app that corrects distortion in photos created by the add-on lenses. (slashgear.com)
the remainder of the lens corrects for distant objects (about 20 ft from the eyes). (encyclopedia.com)
And lens calibration corrects how 'off' the lens is. (adobe.com)
A prescription for contact lenses, therefore, involves more than simply knowing the optical power that corrects for nearsightedness, farsightedness, or astigmatism. (aoa.org)

Anybody with existing Leica M lenses, or with a strong urge to buy some, will be pleased as it has been revealed that an M mount adaptor will be available. (techradar.com)
Voigtlander 25mm VM F4 Color Skopar lens Leica fit, mint- Rangefinder coupled. (ebay.co.uk)
Canon 100mm f3.5 Leica screw lens + case, hazy. (ebay.co.uk)

Seeking to retain my trusted Nikon D300, but obtain even sharper, higher resolution images, I investigated the possible purchase of the top-price Nikkor17-55 f2.8G DX AFS IF-ED lens. (cambridgeincolour.com)
Sigma Corporation is pleased to announce of the world's first High Speed Tele Macro MACRO 150mm F2.8 EX DG HSM lens. (dpreview.com)
Sigma Corporation is pleased to announce the new 28-70mm F2.8 EX DG lens. (dpreview.com)

d) Transmission spectra of pHEMA and commercial soft contact lenses when dipped into the dye. (nih.gov)
We offer a wide variety of contact lenses, such as soft contact lenses, frequent replacement soft contact lenses and rigid, gas-permeable contact lenses. (mayoclinic.org)
Toric contact lenses - These are soft contact lenses that are usually made of either the typical hydrogel material or a highly breathable silicone hydrogel. (mercola.com)
You do not need to replace GP lenses as frequently as you do with soft contact lenses, but take note that these are custom-made as well, and can be pricier than toric lenses. (mercola.com)

People who wear toric contact lenses to compensate for astigmatism may also experience headaches due to fit. (news-medical.net)
Rigid glass permeable (RGP or GP) toric contact lenses are other possible options, but these are typically prescribed for severe or unusual astigmatism cases. (mercola.com)

Mark Pennie relies on multifocal contact lenses to stay active on his motorcycle. (nationalpost.com)
There is an alternative outside these traditional options: multifocal contact lenses. (nationalpost.com)
Multifocal contact lenses feature power variations that allow for good vision from near to far and everything in between, all within one lens. (nationalpost.com)
Multifocal contact lenses are useful for almost anyone," says Edmonton optometrist Dr. Michael Kim. (nationalpost.com)
Adding that these multifocal contact lenses are "very exciting for the whole industry," he points out that, as well as being highly effective in terms of visual acuity, they score well because of their comfort, convenience and healthy properties. (nationalpost.com)

My understanding is that the primary reson to get the DX lens over the FX lens was to get the extremely short focal lengths. (cambridgeincolour.com)
The lens has a minimum focusing distance of 40cm (15.7 inches) at all focal lengths and is capable of macro photography with a maximum magnification ratio of 1:3.8. (dpreview.com)

UED (Ultra Extra-Low Dispersion) lens minimize chromatic aberration while the UHR (Ultra High Refractive Index) lens realizes high descriptive performance from corner to corner. (panasonic.com)

An advanced optical design that incorporates two ED (Extra-low Dispersion) glass elements and three aspherical elements offers enviable G Lens image quality throughout the zoom range. (sony.com)

They are typically affordable zoom lenses that offer versatility to beginners. (adobe.com)
The lenses that can be added to the video line-up now include the 14mm pancake lens, the 8mm fisheye lens and the 45-200mm zoom lenses. (techradar.com)

The people who will make your glasses for you need these numbers to create lenses that will correct the way your eye bends light. (kidshealth.org)
This allows the pinhole to be opened up significantly (fourth image) because a thin convex lens bends light rays in proportion to their distance to the axis of the lens, with rays striking the center of the lens passing straight through. (wikipedia.org)
In the last section, we saw that at any one point, a lens bends light beams to a certain total degree, no matter the light beam's angle of entry. (howstuffworks.com)

Contact lenses can lead to corneal ulcers and infections that are so severe that they cause blindness. (mercola.com)
Improperly used contact lenses can lead to corneal abrasions, corneal edema, corneal ulcers or eye infections, necessitating medical or surgical treatment, ultimately increasing costs and undermining quality of life. (aoa.org)

In this short video, Alister Chapman describes how he used the Fujinon MK lenses with the SLR Magic Anamorphot 65 anamorphic 1.33x adaptor, the. (fujifilm.com)
This short documentary was shot using the Fujinon E Mount MK lenses with the SLR Magic Anamorphot 65 1.33x anamorphic adaptor. (fujifilm.com)

Signet Armorlite, Inc. manufactures and sells the above eyeglass lenses. (kodak.com)
Eyeglass lenses are mounted in frames worn on the face, sitting mostly on the ears and nose, so that the lenses are positioned in front of the eyes. (encyclopedia.com)
A separate contact lens -fitting exam is necessary if the patient wants contact lenses, because an eyeglass prescription is not the same as a contact lens prescription. (encyclopedia.com)
To be suitable for eyeglass lenses, a material must be transparent, without bubbles, and have a high index of refraction. (encyclopedia.com)
Glass was the first material to be used for eyeglass lenses, and was used for several hundred years before plastic was introduced. (encyclopedia.com)

Wearing contact lenses puts you at risk of several serious conditions including eye infections and corneal ulcers. (fda.gov)
Some of the possible serious hazards of wearing contact lenses are corneal ulcers, eye infections, and even blindness. (fda.gov)

Eyeglasses and contact lenses are devices that correct refractive errors in vision. (encyclopedia.com)
Cosmetic contact lenses can cause problems if they have not been selected and initially fitted with the help of an optometrist to ensure that they are the correct prescription and to minimize the risk of refractive errors. (news-medical.net)

www.wholesalecontactlists**** There has been much discussion as to the origin of glasses and contact lenses, but they are generally believed to have been known at a period much earlier than that of Salvino degli Armati. (metacafe.com)

fisheye lens on Wikipedia. (wiktionary.org)

Soft Contact Lens market is further analyzed by the following sub-segments for US, Japan , Europe , and Rest of the World markets: Spherical Lenses, Toric Lenses, and Multifocals. (prnewswire.com)

The Verisyse lens, made my Advanced Medical Optics, is racing STAAR Surgical neck and neck for the first FDA approval of a permanent, implantable contact lens. (wired.com)
The Struman Optics case, the clip, and three phone lenses. (digital-photography-school.com)
Struman Optics has come up with a set of lenses that consider all aspects of using them along with different phone products. (digital-photography-school.com)
Unlike many other lenses for mobile phones, the Struman Optics ones have covers for the top two brands - both iPhone and Samsung. (digital-photography-school.com)
The Struman Optics macro lens is incredible. (digital-photography-school.com)

Fujifilm/FUJINON presents Rhinestone Blue, the first film shot on PREMISTA large format lenses. (fujifilm.com)

But eyeglasses or contact lenses, also called corrective lenses, can help most people see more clearly. (kidshealth.org)
this includes prescribing eyeglasses and contact lenses, but also doing eye surgery for other eye-related problems. (kidshealth.org)
An optometrist is a licensed professional who specializes in eye exams and in figuring out the right prescriptions for eyeglasses and contact lenses. (kidshealth.org)
Contact lenses are a convenient and comfortable alternative to eyeglasses for many people. (webmd.com)
Unlike eyeglasses, contact lenses will not fog up due to changes in temperature, and they will not become smudged or smeared during the day. (walgreens.com)
In addition, contact lenses fully cover the eye, so that your vision is enhanced no matter which direction you look - a benefit that eyeglasses cannot provide. (walgreens.com)
Just like prescription eyeglasses, you cannot simply wear just any type of contact lenses if you have a refractive error. (mercola.com)

If you have autofocus lenses they will work on any pentax digital slr. (ephotozine.com)

At the higher end of the focal range spectrum are telephoto lenses, which can range from 70mm up to 500mm and even higher. (adobe.com)
I have two camera bags, I purchased the second to fit a 70-300mm telephoto lenses attached to the camera. (cambridgeincolour.com)

While in principle a simple convex lens will suffice, in practice a compound lens made up of a number of optical lens elements is required to correct (as much as possible) the many optical aberrations that arise. (wikipedia.org)
A first step is to put a simple convex lens at the pinhole with a focal length equal to the distance to the film plane (assuming the camera will take pictures of distant objects [1] ). (wikipedia.org)
For a double convex lens the radius R 1 is positive since it is measured from the front surface and extends right to the center of curvature. (gsu.edu)

There's a feature on the K20 D where if you install a lens that doesn't have all the digital bells and whistles, a message comes up on the monitor to set the focal lenght of the lens and the Image Stabiliser will work with it. (ephotozine.com)

The greater the index of refraction, the thinner the lens can be. (encyclopedia.com)

Micro Four Thirds 100-300mm Telephoto Zoom Lens / 200-600mm (35mm camera equiv. (panasonic.com)
The Tair 3 is a 300mm f/4.5 telephoto lens. (wikipedia.org)
The lens enjoys a reputation of having excellent image quality The Tair 33 is a 300mm f/4.5 telephoto lens for Kiev 88 (V Mount, Tair-33V) and Pentacon Six or Kiev 60 system (P6 Mount, Tair-33B). (wikipedia.org)

Make sure you clean and disinfect your lenses and lens case correctly, and don't keep either longer than you should. (webmd.com)
Clean and disinfect your lenses properly according to the labeling instructions. (fda.gov)

The size of the contact lens market is likely to grow due to the increasing occurrence of eye-related conditions such as astigmatism , hyperopia and myopia . (wikipedia.org)
Color lenses change the color of the eyes while correcting vision, while toric lenses are made for people with an eye condition called astigmatism, which affects the way the eye focuses. (walgreens.com)
Are Contact Lenses Safe for Astigmatism? (mercola.com)
They work because their uniform front surface acts as the primary refracting surface of the eye, therefore correcting astigmatism without the control rotation mechanism of toric lenses. (mercola.com)
The problem with relying on contact lenses for astigmatism or any refractive error is that they can put you at risk of infection. (mercola.com)

Lens replacement surgery also can correct myopia (nearsightedness), but generally it is not recommended when LASIK, PRK or phakic IOLs are available. (allaboutvision.com)
Children can independently wear and care for these contact lenses in the age range of nearsightedness, starting about age 7 and beyond," Walline said. (webmd.com)

The best way to protect your eyes from potential complications is to talk to your eye doctor about decorative contacts and learn about healthy contact lens wear and care habits. (cdc.gov)
Download sample Halloween-themed social media messages to learn more about healthy contact lens wear and care. (cdc.gov)
Order or download posters to promote healthy contact lens wear and care habits. (cdc.gov)
Contact Lens Health Week aims to increase public awareness and promote healthy contact lens wear and care. (cdc.gov)
CDC is sharing the stories of three people- Whitney , Te' , and Ryan -who suffered from serious eye infections caused by improper contact lens wear and care. (cdc.gov)
Hygiene is the most critical aspect of successful long-term contact lens wear. (aoa.org)

Contact an AOA-member doctor of optometry with questions about proper contact lens use and for any other eye health concerns. (aoa.org)

Some decorative contact lenses can turn your Halloween into a nightmare. (cdc.gov)
Educate yourself and others about the dangers of using decorative contact lenses without a prescription. (cdc.gov)
Decorative contact lenses bought from costume shops, online stores, beauty salons, convenience stores, flea markets, or any place where a prescription is not required will not be properly fitted to your eyes. (cdc.gov)
The report says the demand for decorative contact lenses continues to increase, particularly among teenage girls and young women, with consumers spending approximately $180 million on them so far. (emory.edu)
Because of the growing market, the report states: 'American young people remain at risk as a major target of the unauthorized sale of decorative contact lenses. (emory.edu)
Having trendy decorative contact lenses is not worth losing your sight. (emory.edu)
Encounter problems associated with decorative contact lenses? (aoa.org)

Understand which camera lenses to use and when. (adobe.com)
Camera bodies are often sold in combination with a lens. (adobe.com)
Photographers who know what they want can purchase a camera body on its own and then choose their desired lens. (adobe.com)
Common types of camera lenses. (adobe.com)
A camera lens (also known as photographic lens or photographic objective ) is an optical lens or assembly of lenses used in conjunction with a camera body and mechanism to make images of objects either on photographic film or on other media capable of storing an image chemically or electronically. (wikipedia.org)
There is no major difference in principle between a lens used for a still camera , a video camera , a telescope , a microscope , or other apparatus, but the detailed design and construction are different. (wikipedia.org)
If one were inside the camera, one would see the lens acting as a projector . (wikipedia.org)
A camera lens may be made from a number of elements: from one, as in the Box Brownie 's meniscus lens, to over 20 in the more complex zooms. (wikipedia.org)
Fingertip control of zoom speed via the zoom lever on the lens barrel or the zoom ring makes it possible to zoom smoothly while maintaining a sure, steady grip on the camera. (sony.com)
Micro Four Thirds 50-200mm Telephoto Zoom Lens / 100-400mm (35mm camera equiv. (panasonic.com)
Micro Four Thirds 8-18mm Wide Zoom Lens / 16-36mm (35mm camera equiv. (panasonic.com)
Micro Four Thirds 12-60mm Standard Zoom Lens / 24-120mm (35mm camera equiv. (panasonic.com)
Micro Four Thirds 35-100mm Telephoto Zoom Lens / 70-200mm (35mm camera equiv. (panasonic.com)
Micro Four Thirds 12-35mm Standard Zoom Lens / 24-70mm (35mm camera equiv. (panasonic.com)
Micro Four Thirds 45-200mm Telephoto Zoom Lens / 90-400mm (35mm camera equiv. (panasonic.com)
Micro Four Thirds 42.5mm Fixed Focal Length Lens / 85mm (35mm camera equiv. (panasonic.com)
However, it's rumored that Sony will be releasing a camera lens attachment with the same specs as the RX100 II that was recently unveiled . (slashgear.com)
Here as we saw very, very briefly earlier this week , we've gotten another look at a key accessory for this machine - a camera grip that makes the machine much more like the big-handling machines its amalgamation of lenses and processing abilities suggests. (slashgear.com)
There are a handful of camera lenses that you can get for the iPhone, which allow you to take a number of unique photos using a fisheye effect or better macro focus. (slashgear.com)
This camera will work with a fabulous 20x Genuine Canon HD Video Lens and the ability to record straight to MP4. (slashgear.com)
Learn everything you want about Camera Lenses with the wikiHow Camera Lenses Category. (wikihow.com)
This video explains all the benefits of MK lenses with Blackmagic Pocket Cinema Camera 4K. (fujifilm.com)
It's like a miscommunication between camera and lens," says photographer Jason Weingart. (adobe.com)
When you first buy a lens, it should function predictably with your camera body and your autofocus system should work well. (adobe.com)
But for some, this may occur about every six months to two years for each camera and lens combination. (adobe.com)
No, lens calibration is not needed with a mirrorless camera and lens. (adobe.com)
My lenses are high quality and I wish to use them on any camera I purchase. (ephotozine.com)
I'm willing to invest in lenses, but my experience has been that 70-80% of the shots I take are created pretty quickly: grab the camera, adjust the zoom, and shoot. (cambridgeincolour.com)
I now have a Canon 500D, and a 17-55 2.8 IS USM lens, and it's pretty much always on the camera. (cambridgeincolour.com)
I can fit my camera, a second lens, and a bridge camera in one bag. (cambridgeincolour.com)
Having two camera bodies will cut down on the need of changing out lenses, but you know what. (cambridgeincolour.com)
For travel and documentary work, I only carry 2-3 lenses (on average two, usually a fast prime like 35/50 2/1.4, a mid range zoom, and/or telephoto zoom) and only one camera on me. (cambridgeincolour.com)
A standard 50 mm camera lens doesn't significantly magnify or shrink the image, making it ideal for shooting objects that aren't especially close or far away. (howstuffworks.com)
A camera lens is actually several lenses combined into one unit. (howstuffworks.com)
As yet there are no prices available for the camera, lenses or accessories. (techradar.com)
Some are better than others with most requiring a magnetic ring to attach them to your phone, over the camera lens. (digital-photography-school.com)
Some have good lenses, but the rings don't work, while others are designed for a particular camera and aren't good on other models. (digital-photography-school.com)
The phone covers have a section where the camera is that allows you to screw in the lens so it is aligned perfectly with the camera. (digital-photography-school.com)
The second is a telephoto lens that also has a holder for your phone and small tripod that you can use to help you steady the camera. (digital-photography-school.com)
We ll safely remove this grime while protecting the most important and sensitive components of your camera and lens. (nikonusa.com)
Nikon s remarkable system architecture allows for performance upgrades and enhancements through camera and lens firmware updates. (nikonusa.com)
Expand Collapse My camera or lens seems fine. (nikonusa.com)
Google filed a patent for a camera-containing contact lens. (popsci.com)

As in cataract surgery, three types of IOLs are available to replace your natural lens, depending on your vision needs and the health of your eyes. (allaboutvision.com)
The present invention relates to intraocular lenses (IOLs) and a method for making and using the same. (google.com.au)

Such lenses are sometimes called progressives or no-line bifocals. (encyclopedia.com)

This photo was taken with my phone and the macro lens screwed into the phone case. (digital-photography-school.com)
When you screw in the Struman macro lens, you can get a whole lot closer and capture a lot more detail. (digital-photography-school.com)

She reported wearing disposable contact lenses for approximately six months, often sleeping in them. (emory.edu)

Indie Lens Storycast - YouTube (youtube.com)

The most UNDERRATED lens EVERYONE needs! - YouTube (youtube.com)

Through a lens - Americas | The National Archives (nationalarchives.gov.uk)

Jill Greenberg: The Female Lens | TED Talk (ted.com)

Specter Sunglasses: Titanium Frame, Blackout Lens | Indiegogo (indiegogo.com)

Contact Us | Transitions Lenses (transitions.com)

Telescopic Lens - Item - World of Warcraft (wowhead.com)

2020 - A year in review through our lens | ICRC (icrc.org)

Combine DSLR&Mobile: 12mm Ultra Wide Aspheric Lens | Indiegogo (indiegogo.com)

LensCoat TravelCoat for Select Canon Lenses (Black) TC100400BK (bhphotovideo.com)

Hawaiian Lenses - Sunglasses with Readers (liciamcdonald) on Pinterest (pinterest.com)

Chiara Lens (chiaralens) - Profile | Pinterest (pinterest.com)

Universal Lens Cap - 1 Cap for Every DSLR Lens | Indiegogo (indiegogo.com)

Free Lense Photo (freelensephoto) on Pinterest (pinterest.com)

ViViD Lens Photography (vividlensphotog) - Profile | Pinterest (pinterest.com)

Anatomy35

Organisms20

Diseases39

Chemicals and Drugs56

Analytical, Diagnostic and Therapeutic Techniques and Equipment65

Psychiatry and Psychology6

Phenomena and Processes35

Disciplines and Occupations4

Technology, Industry, Agriculture10

Information Science3

Health Care9

The role of optical defocus in regulating refractive development in infant monkeys. (1/242)

The growing eye: an autofocus system that works on very poor images. (2/242)

Long-term changes in retinal contrast sensitivity in chicks from frosted occluders and drugs: relations to myopia? (3/242)

The response to prism deviations in human infants. (4/242)

Recent developments in clinical photography. (5/242)

Effect of adaptation to telescopic spectacles on the initial human horizontal vestibuloocular reflex. (6/242)

Clinical effect of low vision aids. (7/242)

Form-deprivation myopia in monkeys is a graded phenomenon. (8/242)

Lenses

Contact Lenses

Contact Lenses, Hydrophilic

Parenteral Nutrition, Home

Lens Cortex, Crystalline

Paranasal Sinus Diseases

Paraparesis, Spastic

Parasitemia

Cataract

Crystallins

Contact Lenses, Extended-Wear

Lens Subluxation

Contact Lens Solutions

Paraproteins

Presbyopia

Accommodation, Ocular

Refraction, Ocular

Eye Proteins

Posterior Capsule of the Lens

beta-Crystallins

Cataract Extraction

Aphakia

Eyeglasses

alpha-Crystallins

Eye

Lens Plant

Cornea

Anterior Capsule of the Lens

Myopia

Silicones

Phacoemulsification

delta-Crystallins

Epithelial Cells

Hyperopia

Refractive Errors

Optics and Photonics

Visual Acuity

Phakic Intraocular Lenses

Pseudophakia

Aquaporins

Aging

Aphakia, Postcataract

beta-Crystallin B Chain

Silicone Elastomers

Iris

Capsulorhexis

Narcolepsy

Prosthesis Fitting

Corneal Edema

Epithelium

Proto-Oncogene Proteins c-maf

Paired Box Transcription Factors

Anterior Eye Segment

Tears

Corneal Topography

Astigmatism

Cattle

Vitreous Body

alpha-Crystallin B Chain

Microphthalmos

Salamandridae

Connexins

Ciliary Body

beta-Crystallin A Chain

Biometry

Acanthamoeba Keratitis

Corneal Ulcer

Corneal Diseases

Chick Embryo

Fluorescent Antibody Technique, Indirect

Aldehyde Reductase

Rabbits

Organ Culture Techniques

Hydrogel

Photography

Cell Differentiation

Notophthalmus viridescens

Capsule Opacification

Acanthamoeba

Scattering, Radiation