Cornea Care

Introduction
Cornea is the transparent, dome-shaped tissue covering the front of the eye. It is like the watch glass of a wrist watch. Cornea is a powerful refracting surface and provides about 2/3rd of the eye's focusing power. Diseases of the cornea, due to injury or infection lead to loss of its transparency, thus reducing the vision.

Corneal Transplant or Keratoplasty
Diseased corneas can now be replaced successfully by transplanting a human donor cornea to the diseased eye. Replacing the unhealthy cornea with a healthy corneais the only way of restoring vision. CORNEAL TRANSPLANTATION is one of the most successful organ transplant surgeries.
Corneas for transplant come from individuals who have donated their eyes for use after death. Prasad eye hospital will soon have facilities for eye banking & corneal transplantation.

Keratoconus
Keratoconus is a bilateral progressive disorder of unknown cause that typically starts during adolescence. It is usually an inherited corneal disorder which means that approximately 50% of family members may have it.

The cornea consists of finely arranged layers or lamellae of connective tissue called collagen that make up to 90% of its substance. The cross linking in between these layers get weaker in keratoconus leading to progressive thinning and stretching of the cornea. Normal pressure within the eye causes the cornea to bulge forward into an irregular cone shape.

In early stages of keratoconus, Rigid gas permeable contact lenses can be tried. But in progressive cases, corneal collagen cross-linking is the treatment of choice.

 

CORNEAL COLLAGEN CROSSLINKING WITH RIBOFLAVIN (C3-R)
A new non surgical, non invasive treatment, based on collagen cross linking with Ultraviolet A (UVA, 365nm) and riboflavin (Vitamin B 2), a photosensitizing agent is now available. This changes the intrinsic biomechanical properties of the cornea, increasing its mechanical strength. This increase in corneal strength has shown to arrest the progression of keratoconus.

Collagen cross-linking treatment is not a cure for keratoconus. The main aim of this treatment is to arrest progression of keratoconus, and thereby prevent further deterioration in vision and the need for corneal transplantation.Following the cross-linking treatment it makes the patient more comfortable to wear contact lens.

Corneal Transplant
Diseased corneas can now be replaced successfully by transplanting a human donor cornea to the diseased eye. Replacing the unhealthy cornea with a healthy cornea is the only way of restoring vision. CORNEAL TRANSPLANTATION is one of the most successful organ transplant surgeries.

Corneas for transplant come from individuals who have donated their eyes for use after death who is free from transmissible diseases like HIV, Hepatitis and Syphilis. The donor cornea is itself screened for any pathology and then stored in a nutritive medium temporarily till use.

The donor cornea is secured on the patient’s eye with fine thin sutures made of nylon; about 8 to 16 sutures are put. These sutures can be removed later on after a period of 3 to 6 months. The corneal transplant procedure can be combined with cataract surgery and lens implantation when it is called “triple procedure”.

 

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