• Light rays are focused through the transparent cornea and lens upon the retina. (utah.edu)
  • Light that has been focused through the cornea and aqueous humor hits the lens, which then focuses it further, sending the light rays through the vitreous humor and onto the retina. (kidshealth.org)
  • A slit-lamp, which is a specialized magnifying microscope, is used to examine the structures of the eye (including the cornea, iris, vitreous, and retina). (mountsinai.org)
  • Light images from the outside pass through the central visual system (cornea, the lens, and fluids) to land upon the retina. (cdc.gov)
  • Together with the cornea, the lens helps refract all of the light that enters the eye and focus it on the innermost layer, the retina. (todayifoundout.com)
  • The ocular tissue where these tumors arise, the uvea, is a densely pigmented layer that lies for the most part between the sclera and the retina. (medscape.com)
  • In the cornea he observed no change, and while he believed that a change took place in the back of the lens, he considered it so slight as to be negligible. (freesmfhosting.com)
  • and then two lights or one doubled by reflection from a mirror so placed behind a diaphragm having two rectangular openings that the rays shone through the openings upon the cornea and lens. (freesmfhosting.com)
  • That from the front of the lens forms an upright image of the flame somewhat larger than that reflected from the cornea but usually so faint that the form of the flame cannot be definitely distinguished. (freesmfhosting.com)
  • Anterior chamber (between cornea and iris), Posterior chamber (between iris, zonule fibers and lens) and the Vitreous chamber (between the lens and the retina). (utah.edu)
  • All objects we see send light rays unto our eyes which are then bent or refracted by four structures- first the cornea, and then crystalline lens- strongest capacity to refract, then aqueous humor and the vitreous humor- gel like substance that provides the bulk of the eyeball. (sunstar.com.ph)
  • The cornea and aqueous humor form an outer lens that refracts (bends) light on its way into the eye. (kidshealth.org)
  • The portion of the lens that covers the cornea is a domed surface. (technovelgy.com)
  • But sclera contacts, they're the dramatic chandelier earrings of the lens world. (bitrebels.com)
  • A reservoir of sterile saline solution rests between the back of the lens surface and the cornea. (hopkinsmedicine.org)
  • AmbioDisk is a thin sheet of dehydrated amniotic membrane which can be selectively cut to match a patient's corneal defect and held in place on the cornea using a soft contact lens. (hopkinsmedicine.org)
  • Moreover, the reservoir of pure saline solution between the back surface of the lens and the front of the cornea ensures that the eye is always in a liquid environment - making it optimal for health and comfort. (turnereye.com)
  • Their ability to transmit oxygen reduces eye problems, such as dry eyes, which is caused by diminished oxygen transmission to the cornea - common among most soft lens' brands or hard (non-GP) lenses. (turnereye.com)
  • Ocular toxicity of some corneal penetration enhancers evaluated by electrophysiology measurements on isolated rabbit corneas. (aaem.pl)
  • This creates an environment that continuously hydrates the cornea and rehabilitates chronically damaged ocular surfaces. (hopkinsmedicine.org)
  • Oftalmológicamente, se manifiesta al aparecer en la superficie externa del globo ocular como un surco ligero, delimitando la línea entre la córnea transparente y la esclerótica. (bvsalud.org)
  • The sclera forms the posterior five-sixths of the connective tissue coat of the human eyeball. (wikipedia.org)
  • It is continuous with the dura mater and the cornea, and maintains the shape of the eyeball, offering resistance to internal and external forces, and provides an attachment for the extraocular muscle insertions. (wikipedia.org)
  • The white part of the eyeball is called the sclera (say: SKLAIR-uh). (kidshealth.org)
  • The sclera is made of a tough material and has the important job of covering most of the eyeball. (kidshealth.org)
  • The "white of the eye" , the sclera, which forms part of the supporting wall of the eyeball. (utah.edu)
  • This tough, fibrous tissue surrounds the eyeball and attaches to the cornea, which is the clear front surface of the eye. (kidshealth.org)
  • V2 - eyeball model: CORNEA 1.subdiv / 364 polys, 2.subdiv / 1456 polys. (3d.sk)
  • It is ophthalmologically significant in that it appears on the outer surface of the eyeball as a slight furrow, marking the line between the clear cornea and the sclera. (bvsalud.org)
  • In humans, and some other vertebrates, the whole sclera is white or pale, contrasting with the coloured iris. (wikipedia.org)
  • This is not just due to the white color of the human sclera, which many other species share, but also to the fact that the human iris is relatively small and comprises a significantly smaller portion of the exposed eye surface compared to other animals. (wikipedia.org)
  • Behind the cornea are the iris, the pupil, and the anterior chamber. (kidshealth.org)
  • The anterior (say: AN-teer-ee-ur) chamber is the space between the cornea and the iris. (kidshealth.org)
  • A transparent external surface , the cornea, that covers both the pupil and the iris. (utah.edu)
  • The cornea is the clear part of the outer layer of the eye that covers the iris and the pupil. (bbc.co.uk)
  • The colored circular membrane in the eye just behind the cornea is called the iris . (kidshealth.org)
  • It leaves the eye through channels where the iris and cornea meet. (mountsinai.org)
  • The cornea is the clear covering on the front of the eye that is in front of the iris, pupil, and angle. (mountsinai.org)
  • Postoperative corneal melts are more common in less advanced counties, where nutritional deficiencies play a major part in the health of the cornea. (medscape.com)
  • Postoperative corneal melts commonly occur in patients with compromised corneas who are in their fourth or fifth decades or even in those who are elderly. (medscape.com)
  • From outer to innermost, the four layers of the sclera are: episclera stroma lamina fusca endothelium The sclera is opaque due to the irregularity of the Type I collagen fibers, as opposed to the near-uniform thickness and parallel arrangement of the corneal collagen. (wikipedia.org)
  • Image: The cornea, as demarcated from the sclera by the corneal limbus. (pharmaceutical-technology.com)
  • Corneal transplantation is a procedure used to help prevent or restore vision loss resulting from damage to the cornea. (hopkinsmedicine.org)
  • Outcomes of corneal transplantation in Europe: report by the European Cornea and Cell Transplantation Registry. (who.int)
  • At the optic disc the outer two-thirds of the sclera continues with the dura mater (outer coat of the brain) via the dural sheath of the optic nerve. (wikipedia.org)
  • The sclera, also known as the white of the eye or, in older literature, as the tunica albuginea oculi, is the opaque, fibrous, protective outer layer of the human eye containing mainly collagen and some crucial elastic fiber. (wikipedia.org)
  • The outer layer or tunic (sclera, or white, and cornea) is fibrous and protective. (mountsinai.org)
  • The lamina cribrosa are small openings within the sclera where the fibers forming the optic nerve travel through. (histology-world.com)
  • In the cornea, for instance, fibers with high in-depth inclination have been shown to be mechanically important. (bvsalud.org)
  • In-depth fiber orientation distributions and anisotropy (degree of fiber alignment) accounting for fiber density were quantified over the whole sclera and in 15 regions: central cornea, peripheral cornea, limbus, anterior equator, equator, posterior equator, posterior sclera and peripapillary sclera on both nasal and temporal sides. (bvsalud.org)
  • Complete ophthalmic examination including a Schirmer tear test, fluorescein staining of the cornea, tonometry, examination of the eyelids and surface of the eye with magnification (such as slit-lamp biomicroscopy), and detailed examination of the front and back portions of the eye. (petplace.com)
  • With each blink, our eyelids spread a layer of mucus, oil, and tears over the cornea, which covers the front of the eye. (kidshealth.org)
  • The sclera is perforated by many nerves and vessels passing through the posterior scleral foramen, the hole that is formed by the optic nerve. (wikipedia.org)
  • The thickness of the sclera varies from 1 mm at the posterior pole to 0.3 mm just behind the insertions of the four rectus muscles. (wikipedia.org)
  • The sclera, like the cornea, contains a basal endothelium, above which there is the lamina fusca, containing a high count of pigment cells. (wikipedia.org)
  • The activation energy of conductivity were similar for the healthy and smoky cornea as a consequence of the braking of hydrogen and Van der Waals bonds between loosely bound water, and the proteins of channels in the epithelium and endothelium. (aaem.pl)
  • Light passing through the cornea is converged (bent) where it passes through the anterior chamber and the pupil, a circular opening regulating the amount of light entering the eye. (medscape.com)
  • The choices can be daunting, but two types stand out - the conventional contact lenses and the dramatic sclera contacts. (bitrebels.com)
  • In many vertebrates, the sclera is reinforced with plates of cartilage or bone, together forming a circular structure called the sclerotic ring. (wikipedia.org)
  • If these routes are no longer functional because of massive thrombosis, then the integrity of the cornea is threatened, and sterile necrosis leading to melting syndrome may be inevitable. (medscape.com)
  • This creates a new optical surface and prevents discomfort by minimizing irritation to the cornea. (turnereye.com)
  • The differences between the healthy and the smoky cornea concerned the temperature ranges in which there appeared the decomposition of loosely-bound water and β-relaxation associated with polar side-chains relaxations on protein molecules of this tissue. (aaem.pl)
  • The results are interpreted as caused by the toxic compounds of the tobacco smoke leading to higher ion transport in the nonhomogeneous structure of the cornea when compared to that of the control tissue. (aaem.pl)
  • Recognition of the effect of frequency and temperature on the dielectric behaviour of the smoky cornea may be of interest for disease characterization of this tissue. (aaem.pl)
  • They discovered that Mooren ulcer, the painful ulceration of the cornea, is an autoimmune disorder. (medscape.com)
  • This nerve fiber distribution is the reason why large, superficial ulcers of the cornea may be more painful than smaller, deeper ulcers. (petplace.com)
  • The eyes of all non-human primates had been thought to be dark with small, barely visible sclera, but recent research has suggested that white sclera are not uncommon in chimpanzees, and are also present in other mammals. (wikipedia.org)
  • Poke a small hole through the cornea at the cornea sclera junction. (jove.com)
  • Applanation tonometry uses a slit lamp with supports for your forehead and chin and a small cone that gently touches your cornea after it has been made numb with eye drops. (mountsinai.org)