The cornea is the front, outermost layer of the eye. Just as a window lets light into a room, the cornea lets light into the eye. It also focuses the light passing through it to make images clear and sharp.
Corneal problems can happen to anyone at any age. Sometimes due to disease, injury or infection the cornea becomes cloudy or warped. A damaged cornea, like a frosted or misshapen windowpane, distorts light as it enters the eye. This causes distortion in vision.
When there is no other remedy, doctors advise a corneal transplant. In this procedure an ophthalmologist surgically replaces the diseased cornea with a healthy one to restore clear vision.
This leaflet will answer some questions that you may have about corneal transplants.
Anything you see is an image that enters your eye in the form of light. The different parts of your eye collect this light and send a message to your brain, enabling you to see. For perfect vision all the parts of your eye need to work properly.
The corneal tissue used for transplantation is supplied by an Eye Bank. Eye Banks work round the clock to collect, evaluate, and store donated corneas. The corneas are collected from human donors within hours of death. Stringent tests are done to ensure the safety of the person receiving the cornea. The Eye Bank verifies the donor's medical history and cause of death, and performs blood tests to ensure that the deceased person did not have any contagious disease, such as AlDS or hepatitis.
A clear(vitreous)gel fills the inside of the eye, giving it shape.
If you are advised to undergo a corneal transplant, your ophthalmologist will tell you about the procedure. The transplant will be scheduled according to the condition of your eye and availability of a donor cornea. Sometimes shortage of donor corneas may delay surgery.
If both your eyes need new corneas, the second transplant will not be performed until the first eye has stabilized, which may take up to a year.
If you are taking any other medication, ask your ophthalmologist whetheryou should continue it. You will probably be asked not to eat or drink anything for several hours before the surgery.
Usually local anesthesia is used, so you will be awake but feel no pain. The nerves in your eye will be completely numbed so you will not be able to see or move your eye. Sometimes the doctor may use general anesthesia.
For the transplant, doctors use an operating microscope and very delicate instruments. Once the old cornea is removed, the new cornea is stitched into place. The sutures or stitches are barely visible and are not painful, although you may feel some irritation ora scratching sensation for a few days.
If necessary, other procedures, may be performed at the same time as your transplant. Your ophthalmologist will advise you about them.
As with other surgical procedures, a corneal transplant involves some risks and most of them can be treated. Some possible complications are:
Rejection of a transplanted cornea can occur any time, but is more likely to happen in the first year after surgery. Rejection reduces the chance of success of any repeat corneal transplantation. However, rejection can be prevented by good compliance with post op medication, timely diagnosis and appropriate management.
Redness
Sensitivity to light
Vision loss
Pain
The acronym 'RSVP' can help you remember these symptoms. If you notice any of these in your operated eye, however minor they may seem and regardless of the time of day, contact us immediately. If this is not possible, visit an ophthalmologist, preferably a cornea specialist.
You can bathe carefully from below the neck and shave, but do not let the operated eye get wet for at least 15 days. You may gently clean the eyelids with a piece of cotton boiled in water or a sterilized tissue. Do not wet the eyeball. You should wear an eye patch at night; the doctor willadvise you when to discontinue using it during the day. Always wear protective glasses or an 'eye shield' to avoid accidental injury.
At the time of discharge our patient counselor will advise you about medication and follow-up visits. Please follow the instructions regarding medication. Please adhere to the follow up appointment date.
If you have any concerns or questions, ask the doctor when you come for an examination. If you feel you cannot wait, call or email us.
If there is an emergency at night, during a weekend, or on a holiday, visit your nearest hospital.
Always mention the patient's ID number, name and the doctor's name in all communications.