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Topic: Cornea

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In the News (Tue 23 Apr 19)

  Cornea - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-11-06)
Because transparency is of prime importance the cornea does not have blood vessels; it receives nutrients via diffusion from the tear fluid at the outside and the aqueous humour at the inside and also from neurotrophins supplied by nerve fibres that innervate it.
The cornea is composed mostly of dense connective tissue, similar to the surrounding sclera.
The cornea is innervated by the long posterior ciliary nerves that branch from the trigeminal nerve's ophthalmic division.
en.wikipedia.org /wiki/Cornea   (724 words)

 Cornea transplant - Wikipedia, the free encyclopedia
A cornea transplant, also known as a corneal graft or penetrating keratoplasty, is a surgical procedure where a damaged or diseased cornea is replaced by donated corneal tissue which has been removed from a recently deceased individual having no known diseases which might affect the viability of the donated tissue.
The cornea is the clear part of eye in front of the iris and pupil.
Patients with synthetic corneas have been reported to be able to see into the near-ultraviolet spectrum, as the synthetic material is transparent to near-UV while a natural cornea is not.
en.wikipedia.org /wiki/Cornea_transplant   (1739 words)

Corneal stromal dystrophies are disorders of the middle layer of the cornea.
Hyphema is the accumulation of blood in the space between the cornea and the iris.
The condition is due to weakening and thinning of the central portion of the cornea causing a change in shape of the central portion of the cornea.
www.coopereyecare.com /cornea.htm   (2385 words)

 The Cornea   (Site not responding. Last check: 2007-11-06)
The cornea is the transparent tissue that covers the front of the eye.
Most of this power resides in the center of the cornea, which is rounder and thinner than the outer part of the tissue and is thus better suited to bend lightwaves.
Although the cornea is clear and seems to lack substance, it is actually a highly organized group of cells and protein.
healthlink.mcw.edu /article/924451309.html   (607 words)

 cornea transplantation
A cornea transplant involves replacing a diseased or scarred cornea with a new one.
In cornea transplant surgery, the surgeon removes the central portion of the cloudy cornea and replaces it with a clear cornea, usually donated through an eye bank.
Cornea rejection can be successfully treated if medication is administered at the first sign of bad symptoms.
www.caridon.com /cornea-transplantation.html   (604 words)

 Facts About the Cornea and Corneal Disease [NEI Health Information]   (Site not responding. Last check: 2007-11-06)
Sometimes the cornea is damaged after a foreign object has penetrated the tissue, such as from a poke in the eye.
This occurs because the cornea is normally thicker in the morning; it retains fluids during sleep that evaporate in the tear film while we are awake.
This loss of cells from the cornea often leads to corneal swelling, distortion of the iris, and variable degrees of distortion of the pupil, the adjustable opening at the center of the iris that allows varying amounts of light to enter the eye.
www.nei.nih.gov /health/cornealdisease   (5769 words)

 Cornea Research Foundation - Cornea Conditions & Updates
This occurs because evaporation of fluid from the cornea is decreased while the eyes are closed during sleep, and accumulation of fluid in the cornea during the night results in corneal swelling (edema).
Corneal hydrops, or marked swelling of the cornea may occur when severe bulging of the cornea results in a tear in the deepest layer of the cornea (Descemet's membrane), allowing fluid from the inside of the eye to permeate the cornea.
The rigid lens masks the underlying irregular cornea and functions as the new refractive surface of the eye, with the tear film filling in the space between the back of the contact lens and the front of the eye.
www.cornea.org /research_cornea.html   (1741 words)

 Cornea   (Site not responding. Last check: 2007-11-06)
The cornea, the eye’s outermost layer, is the clear dome-shaped window at the front of the eye.
This swelling of the cornea is called “corneal edema.” The most common reason for a corneal transplant is the depletion of the endothelial cells, which maintain corneal clarity.
PTK is the removal of the anterior layers of a diseased cornea using the excimer laser.
www.drsteinert.com /cornea/default.aspx   (1515 words)

 Cornea (Eyes): Conditions, Symptoms, and Treatments Information on Medicinenet.com   (Site not responding. Last check: 2007-11-06)
If your cornea becomes damaged through disease, infection, or injury, the resulting scars can interfere with vision by blocking or distorting light as it enters the eye.
This is an inflammation of the cornea that sometimes occurs with infection after bacteria or fungi enter the cornea.
Map-dot-fingerprint dystrophy is the abnormal appearance of the basement membrane of the epithelium of the cornea.
www.medicinenet.com /corneal_disease/article.htm   (1339 words)

 Cornea transplants: Restoring sight with donor tissue - MayoClinic.com
Cornea transplant is one of the most common organ and tissue donation surgeries performed in the United States.
A healthy cornea — the transparent outer surface of your eye — is an essential component of sharp, clear vision.
Cornea transplants are one of the most common organ and tissue transplants performed in the United States.
www.mayoclinic.com /health/cornea-transplant/EY00004   (1404 words)

 The Cornea   (Site not responding. Last check: 2007-11-06)
One-sixth of the outer layer of the eye (called the tunic fibrosa or fibrous tunic) bulges forward as the cornea, the transparent dome which serves as the outer window of the eye.
The cornea is the primary (most powerful) structure focusing light entering the eye (along with the secondary focusing structure, the crystalline lens).
Although this procedure replaces the thinned central portion of the cornea (with a section of donor cornea), contact lenses and/or eyeglasses often continue to be required for maximal visual acuity.
www.tedmontgomery.com /the_eye/cornea.html   (1647 words)

It is the cornea which is treated with refractive surgery using LASIK or PRK.
The cornea mostly consists of transparent connective tissue which on the outside is covered by a kind of thin transparent skin called epithelium.
The cornea does not have any blood vessels of its own, instead the oxygen comes from the air and the tear film and also from the chamber fluid of the eye.
www.capioeye.co.uk /eyeinfo/anatomy/cornea   (405 words)

 Cornea - eye anatomy
The cornea is extremely sensitive - there are more nerve endings in the cornea than anywhere else in the body.
The adult cornea is only about 1/2 millimeter thick and is comprised of 5 layers: epithelium, Bowman's membrane, stroma, Descemet's membrane and the endothelium.
The epithelium is layer of cells that cover the surface of the cornea.
www.stlukeseye.com /anatomy/Cornea.asp   (273 words)

 Viewing Hints
In keratoconus, a corneal transplant is warranted when the cornea becomes dangerously thin or when sufficient visual acuity to meet the individual’s needs can no longer be achieved by contact lenses due to steepening of the cornea, scaring or lens intolerance.
- cornea of the patient, the part of the patient’s cornea that is left in place when the central portion is removed to be replaced with the donor tissue.
- the surgical removal part of the surface of the cornea and its replacement with a donor cornea that is reshaped and transplanted to the patient’s cornea.
www.nkcf.org /transplant.html   (1848 words)

 I Know Why Refractive Surgeons Wear Glasses - EyeKnowWhy   (Site not responding. Last check: 2007-11-06)
Cornea scars and iris pigmentation loss are not easily observable with the naked eye and would not be considered advantageous if they were.
The extent of such scars necessarily depends on the extent of the injury to the cornea lamellae [i.e., tissue layers] and the vehemence of any superadded infection; the amount of clearance of such scars is dependent on the youth of the patient, becoming proportionately less as age advances.
Still, this is a major incision across the horizontal plane of the cornea, and the issue of the type of wound healing that occurs between the cap/flap and the stroma bed, as well as the long term viability of the flap are concerns.
drjoeross.com /refractivesurgery.htm   (12845 words)

In fact, protection of the cornea is the reason emergency washing of the eye is absolutely necessary when the eye is exposed to toxic chemicals.
If the cornea becomes cloudy, the only way to restore sight is to replace or transplant the cornea.
The operation consists of a transfer of the clear central part of the cornea from the donor's eye to the patientís eye.
www.midwesteyecare.com /cornea.htm   (450 words)

 Sclafani Cornea   (Site not responding. Last check: 2007-11-06)
Moving through the cornea, the next structure that we encounter is Bowman’s layer, an 8 to 14 micron thick layer of modified stromal collagen.
The transparency of the cornea is controlled by the hydration state of the stromal proteins called glycosaminoglycans.
Corneal arcus appears as a whitish ring on the peripheral cornea with a clear zone between it and the limbus.
www.opt.pacificu.edu /ce/catalog/10603-AS/Cornea.html   (6360 words)

 EyeHealth Northwest: Medical / Surgical Services - Cornea   (Site not responding. Last check: 2007-11-06)
The cornea is the transparent tissue on the front part of the eye.
Diseases and injuries of the cornea are an important cause of blindness in our community.
Keratoconus is an abnormality in which the symmetric curvature of the cornea is distorted by abnormal thinning and forward bulging of the central portion of the cornea (this is known as ectasia).
www.ehnpc.com /services-cornea.html   (662 words)

 Cornea   (Site not responding. Last check: 2007-11-06)
The Cornea is clear front layer of the eye covering colored iris.
Opacities, scars, swelling or irregular shape causes the cornea to scatter light resulting in blurred vision or glare.
A corneal transplant is an operation in which the diseased cornea is removed (not the whole eyeball) and replaced with a healthy donated human cornea.
www.navjyotieye.com /cornea.html   (412 words)

 Thin Cornea and Lasik, IntraLasik, PRK, LASEK, Epi-Lasik, Intacs, P-IOL, RLE, etc.
Pre-existing thin corneas need to be evaluated before surgery and may exclude a patient from all or some refractive surgery techniques.
What is most important is that there remains a stable and untouched portion of the cornea to insure corneal integrity and stability.
calculate the amount of tissue that will be removed prior to surgery and take measurements of the cornea to determine with reasonable certainty how much cornea will remain and if this is enough to keep stability.
www.usaeyes.org /faq/subjects/thickness.htm   (689 words)

 Larry Wall's Cornea Transplant Diary   (Site not responding. Last check: 2007-11-06)
A normal person doesn't have blood vessels in their cornea, which is why they don't have to do tissue typing for cornea transplants--it's hard for the white blood cells to get to the cornea.
It was just barely touching the cornea at the 7:00 position (5:00 to me, looking in the mirror.) Of course, the first thought that leapt to mind was that this was the Redness of the RSVP mnemonic, and that I was starting to reject the cornea.
The cornea stays the same shape, and the contact lens stays the same shape (if it's a rigid lens), but that means that there are gaps between in the spots where your cornea is flatter than the lens.
www.wall.org /~larry/cornea.html   (12244 words)

 The Cornea Research Foundation
The Cornea Research Foundation of America is pleased to announce the publication of our first book, a collection of 20 inspiring stories of people whose vision has been restored or enhanced by Dr. Francis Price, Jr., MD.
The purpose of the book is to feature individuals whose stirring lives bring a message of hope, faith and courage to those considering surgery to overcome vision-related difficulties.
The Cornea Research Foundation of America, founded in 1988 by Dr. Frank Price, Jr., M.D., is a leading international center for research of corneal disease, intraocular lens surgery, and corneal transplantation.
www.cornea.org   (286 words)

Keratoconus is a hereditary degenerative corneal disease characterized by generalized thinning and cone-shaped protrusion of the central cornea.
A corneal ulcer is caused by bacterial, fungal or viral infection.
The plug is plastic material inserted into the punctum to prevent tear drainage to preserve the tears and moisten the cornea and conjunctiva.
www.missourieye.com /services/cornea.html   (1207 words)

 Cornea   (Site not responding. Last check: 2007-11-06)
Cornea brings together basic and clinical studies on the co">
Cornea The Journal of Cornea and External Disease
Cornea brings together basic and clinical studies on the cornea and the anterior segment of the eye that are critically important to corneal specialists and all general ophthalmologists.
www.lww.com /product?0277-3740   (149 words)

 try a new life with us : welcome!
Astigmatism occurs when the front surface of your eye (cornea) or the lens inside the eye is slightly irregular in shape, resulting in vision being blurred at all distances.
Problems with other parts of the eye (eg, cornea, retina, optic nerve) can be responsible for vision loss and may prevent you from having much or any improvement in vision after cataract surgery.
With angle closure glaucoma, the iris and cornea is not as wide and open as it should be.
www.freewebs.com /drali2020   (10410 words)

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