Anterior and vitreous lens nucleus crystalline. Medical search. Frequent questions

Intraocular pressure control and visual outcome in patients with phacolytic glaucoma managed by extracapsular cataract extraction with or without posterior chamber intraocular lens implantation. (medscape.com)
Treatment is surgical removal and placement of an intraocular lens. (msdmanuals.com)

Well-developed cataracts appear as gray, white, or yellow-brown opacities in the lens. (msdmanuals.com)
Diabetes: Juvenile form characterized by rapidly progressing white "snowflake" opacities in the anterior and posterior subcapsular locations. (entokey.com)
Myotonic dystrophy: Multicolored opacities, "Christmas-tree cataract," behind the anterior capsule. (entokey.com)
3. Cortical: Radial or spoke-like opacities in the periphery that expand to involve the anterior and posterior lens and can cause glare. (entokey.com)
Indications for pars plana vitrectomy include removal of vitreous opacities, relieving vitreoretinal traction, restoring the normal anatomical relationship of the retina and retinal pigment epithelium (RPE), and accessing the subretinal space. (eyewiki.org)

Along with the cornea, aqueous and vitreous humours it refracts light, focusing it onto the retina. (wikipedia.org)
In many fully aquatic vertebrates such as fish other methods of accommodation are used such as changing the lens's position relative to the retina rather than changing lens shape. (wikipedia.org)
Light continues through the vitreous humor and the light converges on the retina, specifically the fovea centralis of the macula. (medscape.com)
It's light sensitive retina and is supplied with a lens system (cornea, lens and refractive media) for focusing images and apparatus for controlling the amount of light acknowledged (the iris diaphragm). (earthslab.com)

A cataract is a congenital or degenerative opacity of the lens. (msdmanuals.com)
Congenital Cataract Congenital cataract is a lens opacity that is present at birth or shortly after birth. (msdmanuals.com)
VCAN -related vitreoretinopathy, which includes Wagner syndrome and erosive vitreoretinopathy (ERVR), is characterized by "optically empty vitreous" on slit-lamp examination and avascular vitreous strands and veils, mild or occasionally moderate to severe myopia, presenile cataract, night blindness of variable degree associated with progressive chorioretinal atrophy, retinal traction and retinal detachment in the advanced stages of disease, and reduced visual acuity. (nih.gov)
Wilson disease: Red-brown pigment deposition in the cortex beneath the anterior capsule (a "sunflower" cataract). (entokey.com)
A mature cataract is defined as lenticular changes sufficiently dense to totally obscure the view of the posterior lens and posterior segment of the eye. (entokey.com)
Rarely, the cortex may liquefy and the nucleus becomes free-floating within the capsule, this is known as a hypermature or Morgagnian cataract. (entokey.com)
3. For preoperative planning, note the degree of pupil dilation, density of the cataract, and presence or absence of pseudoexfoliation syndrome, phacodonesis (quivering of the lens indicating zonular damage or weakness), or cornea guttata. (entokey.com)
The lens shows a whitish cataract with nuclear and cortical changes. (cataractcoach.com)

The lens has three main parts: the lens capsule, the lens epithelium, and the lens fibers. (wikipedia.org)
The lens capsule is a relatively thick basement membrane forming the outermost layer of the lens. (wikipedia.org)
Inside the capsule much thinner lens fibers form the bulk of the lens. (wikipedia.org)
The cells of the lens epithelium form a thin layer between the lens capsule and the outermost layer of lens fibers at the front of the lens but not the back. (wikipedia.org)
The lens capsule is a smooth, transparent basement membrane that completely surrounds the lens. (wikipedia.org)
The capsule is very elastic and so allows the lens to assume a more spherical shape when the tension of the suspensory ligaments is reduced. (wikipedia.org)
Attachment must be strong enough to stop the ligament being detached from the lens capsule. (wikipedia.org)
The anterior and posterior capsule is thinner. (wikipedia.org)
The lens epithelium is a single layer of cells at the front of the lens between the lens capsule and the lens fibers. (wikipedia.org)
The anterior capsule of the lens frequently is dotted with patches of soft white material. (medscape.com)
In contrast to some forms of lens-induced glaucomas (eg, lens particle glaucoma, phacoanaphylactic glaucoma), the lens capsule is grossly intact. (medscape.com)
A transparent, biconvex structure of the EYE, enclosed in a capsule and situated behind the IRIS and in front of the vitreous humor (VITREOUS BODY). (rush.edu)
If the liquefied cortex leaks through the intact capsule, wrinkling of the lens capsule may be seen and phacolytic glaucoma may develop. (entokey.com)
There is a large area of posterior synechiae with three clock hours of iris adherent to the anterior lens capsule. (cataractcoach.com)

Anterior limiting membrane (or Bowman's membrane): It's made up structureless homogeneous mass with no elastic fibres. (earthslab.com)
Distribution of basal membrane complex components in elongating lens fibers. (rush.edu)
In vivo vitreous membrane surgery was performed in experimental rabbit eyes to demonstrate a potential clinical application of picosecond laser-induced optical breakdown. (uni-luebeck.de)

The lens is located towards the front part of the vertebrate eye called the anterior segment which includes the cornea and iris positioned in front of the lens. (wikipedia.org)
Purpose: The purpose of this study was to explore a quantitative grading system of the filtering bleb combined anterior segment optical coherence tomography angiography (AS-OCTA) vascular features and optical coherence tomography (OCT) morphological features. (bvsalud.org)
Pars plana vitrectomy (PPV) is a commonly employed technique in vitreoretinal surgery that enables access to the posterior segment for treating conditions such as retinal detachments, vitreous hemorrhage, endophthalmitis, and macular holes in a controlled, closed system. (eyewiki.org)
[2] [3] In 1974, Conor O'Malley and Ralph Heintz developed the modern-day three-port vitrectomy system - with dedicated ports for vitreous removal using the vitrectomy cutter, infusion of fluid to maintain IOP, and illumination of the posterior segment - using 20-gauge instruments. (eyewiki.org)
The anterior or corneal segment, in consequence of its shorter radius, projects forwards, in front of the scleral portion, the union of the two parts being indicated, externally, by a slight groove, the sulcus scleræ. (co.ma)
ASCRS empowers Anterior Segment Surgeons to improve the vision, outcomes and quality of life for their patients through innovative approaches to Education, Advocacy and Philanthropy. (ascrs.org)
ASCRS Symposia are generally driven by the ASCRS Clinical Committees, offering essential educational content across anterior segment surgery. (ascrs.org)

Slit lamp examination of phacolytic glaucoma typically reveals microcystic corneal edema, and the anterior chamber contains intense flare, large cells (macrophages), aggregates of white material, and iridescent or hyperrefringent particles. (medscape.com)

Photons within the visible spectrum (ie, light) enters the eye first by passing through the cornea, a clear, dome-shaped structure at the anterior post portion of the globe. (medscape.com)
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 cornea is the anterior 1-sixth of the outer layer. (earthslab.com)
Plastic lens: The central part of the cornea gets oxygen from the outside air. (earthslab.com)
Thus, the soft plastic contact lenses worn for long intervals must be permeable to the air in order that oxygen can reach the cornea. (earthslab.com)

The lens is a transparent biconvex spheroid suspended at its equator by zonulas, which are connected to the ciliary body. (medscape.com)
The lens, or crystalline lens, is a transparent biconvex structure in most land vertebrate eyes. (wikipedia.org)

At the front of the lens is the liquid aqueous humor which bathes the lens with nutrients and other things. (wikipedia.org)
As ions, nutrients, and liquid enter the lens from the aqueous humor, Na+/K+-ATPase pumps in the lens epithelial cells pump ions out of the lens to maintain appropriate lens osmotic concentration and volume, with equatorially positioned lens epithelium cells contributing most to this current. (wikipedia.org)
The three refracting media are named, from before backwards, the aqueous humour, the crystalline lens, and the vitreous body. (co.ma)

The core of the crystalline lens, surrounded by the cortex. (mcw.edu)

It is presumed to be synthesized by the lens epithelium and its main components in order of abundance are heparan sulfate proteoglycan (sulfated glycosaminoglycans (GAGs)), entactin, type IV collagen, laminin. (wikipedia.org)
By providing the lens fibers with nutrients and removing waste the cells of the epithelium regulate maintain lens homeostasis. (wikipedia.org)
The cells of the lens epithelium also divide into new lens fibers at the lens equator. (wikipedia.org)

Since the ciliary body had not yet been discovered, he postulated that the change in shape of the crystalline lens is induced by a muscular mechanism within the crystalline lens. (medscape.com)
The lens is held in place by the suspensory ligaments (Zonule of Zinn), attaching the lens at its equator to the rest of the eye through the ciliary body. (wikipedia.org)

The "equator" is the outer edge of the lens often hidden by the iris and is the area of most cell differentiation. (wikipedia.org)
Light is further converged by the crystalline lens located posterior to the iris. (medscape.com)
This photo shows that there is a large gap between the superior iris and the lens. (cataractcoach.com)
When we place the patient in the supine position with the iris parallel to the floor of the room, we look using the indirect ophthalmoscope and the crystalline lens tilts back deeper into the vitreous cavity. (cataractcoach.com)
Estructura transparente biconvexa del OJO, alojada en una cápsula y situada detrás del IRIS y delante del humor vítreo (CUERPO VÍTREO). (bvsalud.org)

PMID- 5428651 TI - Modified lens aspiration needle. (nih.gov)

Discordant expression of the sterol pathway in lens underlies simvastatin-induced cataracts in Chbb: Thom rats. (rush.edu)
Symptoms of IOL usually present in childhood and may include vision problems such as nearsightedness (myopia), blurred vision (astigmatism), clouding of the lenses (cataracts), and increased pressure in the eyes (glaucoma). (nih.gov)

The refractive power of a younger human lens in its natural environment is approximately 18 dioptres, roughly one-third of the eye's total power of about 60 dioptres. (wikipedia.org)

However, the changes in the human lens occur via the relaxation of zonules attached to the ciliary muscle [ 1 , 3 ], whereas the ciliary muscle in the avian eye directly articulates with the equator of the lens [ 2 ], resulting in a squeezing of the lens in the equatorial plane. (molvis.org)
In front of the equator it gives attachment to the tendons of the ocular muscles, while its anterior part is covered by the conjunctiva. (co.ma)

Al-Ghoul KJ, Lindquist TP, Kirk SS, Donohue ST. A novel terminal web-like structure in cortical lens fibers: architecture and functional assessment. (rush.edu)

Chu ER, Durkin SR, Keembiyage RD, Nathan F, Raymond G. Nineteen-year delayed-onset phacolytic uveitis following dislocation of the crystalline lens. (medscape.com)
Chronic anterior uveitis. (entokey.com)
See 12.1, Anterior Uveitis ( Iritis/Iridocyclitis ). (entokey.com)

That was probably the best management done.A closed chamber management of nucleus in such a case is the best option with all the tools vit cutter and frag to deal with any prob what so ever.A management from anterior approach would have lead to a nucleus drop for sure provided it was just attached through a PS. (cataractcoach.com)

Our results raise the possibility that the mechanical properties of the avian lens may be actively regulated in vivo via adjustments to the actomyosin lattice. (molvis.org)

Lens, Crystalline" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus, MeSH (Medical Subject Headings) . (rush.edu)

In 1823, Purkinje noted the reflected images of a candle from the anterior and posterior crystalline lens surfaces. (medscape.com)
[ 13 ] In 1849, Langenbeck was able to observe in a patient that the Purkinje image from the anterior surface of the crystalline lens became smaller during accommodation by using a candle and a magnifying glass. (medscape.com)

Richter C. Lens-induced open angle glaucoma: phacolytic glaucoma (lens protein glaucoma). (medscape.com)

Behind the lens is the jelly-like vitreous body which helps hold the lens in place. (wikipedia.org)
David Kasner first described vitrectomy, or removal of the vitreous body, using an open-sky technique in 1969. (eyewiki.org)

In land vertebrates the lens is flatter on its anterior side than on its posterior side, while in fish the lens is often close to spherical. (wikipedia.org)

In many land animals the shape of the lens can be altered, effectively changing the focal length of the eye, enabling them to focus on objects at various distances. (wikipedia.org)

Helmholtz believed that contraction of the ciliary muscle causes relaxation of the zonular fibers, with a subsequent curvature increase of other anterior and posterior lens surfaces. (medscape.com)

1. Nuclear: Yellow or brown discoloration of the central lens. (entokey.com)

The Helmholtz theory of accommodation is based on the concept that the crystalline lens changes in shape with relaxation of zonular fibers. (medscape.com)
The lens lays down fibers from when it first forms in embryo until death. (wikipedia.org)
Age-related compaction of lens fibers affects the structure and optical properties of rabbit lenses. (rush.edu)

Anterior ciliary arteries pierce the sclera close to corneoscleral junction. (earthslab.com)

a large oval nucleus and is devoid of pigment, while the inner portion is filled with pigment and extends as a series of thread-like processes amongst the outer segments of the rods and cones. (co.ma)

Lens-related glaucoma. (medscape.com)
Pradhan D, Hennig A, Kumar J. A prospective study of 413 cases of lens-induced glaucoma in Nepal. (medscape.com)
Allingham RR, Damji KD, Freedman S. Glaucomas associated with disorders of the lens: phacolytic (lens protein) glaucoma. (medscape.com)

There are various theories on how ciliary muscle contraction alters zonular tension to increase the optical power of the lens during accommodation. (medscape.com)

A human adult the lens is typically about 10mm in diameter and 4mm thick though changes shape with accommodation and size due to grow throughout a person's lifetime. (wikipedia.org)

The front and back of the lens are referred to as the anterior and posterior "poles", like the North and South poles. (wikipedia.org)
The activity of the Na+/K+-ATPases keeps water and current flowing through the lens from the poles and exiting through the equatorial regions. (wikipedia.org)

Actin and myosin within the crystalline lens maintain the structural integrity of lens fiber cells and form a hexagonal lattice cradling the posterior surface of the lens. (molvis.org)

The lens itself lacks nerves, blood vessels, or connective tissue. (wikipedia.org)

PMID- 5428642 TI - Blindness due to aneurysm of anterior communicating artery. (nih.gov)

The stiffness and the optical quality of the control and treated lenses were measured. (molvis.org)
With a pulse duration of 100 picoseconds, only 70 microJ of pulse energy is required to consistently produce optical breakdown in the deep vitreous. (uni-luebeck.de)

Isolated ectopia lentis (IEL) is a genetic disorder that affects the positioning of the lens in the eyes. (nih.gov)

He correctly concluded that the anterior surface of the crystalline lens becomes more convex during accommodation. (medscape.com)

Cytoskeletal protein disruptors led to a decreased stiffness of the lens, and the effects were reversible. (molvis.org)

[ 3 ] Presbyopia, according to Helmholtz, resulted from the decline in elasticity of the lens over decades of time. (medscape.com)
By 25 years of age the ability of the lens to alter the light path has reduced to 10 dioptres and accommodation continues to decline with age. (wikipedia.org)

I also believe that this approach is much more intelligent than an ICCE, not for the risk of a nucleus but also for the risk of the vitrous base manipulation during the loop assisted delivery of a deep located lens. (cataractcoach.com)

This process, called accommodation, is due to a change in shape of the lens. (medscape.com)
When this muscle contracts as an autonomic nervous system response, tension on the zonules is altered, resulting in a change in the shape of the lens. (medscape.com)
[ 7 ] In 1677, Descartes suggested that the shape of the crystalline lens changed. (medscape.com)
He realized that accommodation had to result from a change in position or shape of the crystalline lens. (medscape.com)
He concluded that accommodation results from a change in shape of the crystalline lens. (medscape.com)
Land vertebrate lenses usually have an ellipsoid, biconvex shape. (wikipedia.org)

Opacification of the normally clear crystalline lens. (entokey.com)

This adjustment of the lens is known as accommodation (see also below). (wikipedia.org)
Accommodation is analogous to the focusing of a photographic camera via changing its lenses. (wikipedia.org)

Anatomy8

Diseases4

Chemicals and Drugs4

Analytical, Diagnostic and Therapeutic Techniques and Equipment7

Phenomena and Processes1

Intraocular lens2

Opacities5

Retina4

Cataract8

Capsule14

Membrane3

Segment7

Corneal1

Cornea5

Transparent biconvex2

Aqueous3

Cortex1

Epithelium3

Ciliary body2

Iris5

Aspiration1

Cataracts2

Refractive1

Equator2

Cortical1

Uveitis3

Chamber1

Vivo1

Descriptor1

Purkinje2

Phacolytic glaucoma1

Body2

Vertebrates1

Focal1

Curvature1

Nuclear1

Fibers3

Sclera1

Outer1

Glaucoma3

Zonular1

Typically1

Poles2

Structural1

Nerves1

Blindness1

Optical2

Affects1

Surface1

Protein1

Decline2

Deep1

Shape6

Clear1

Accommodation2