What is an Eye Transplant?

Corneal transplantation is to replace the existing cornea of a patient with a normal cornea of the eye, so that the affected eye can be rejuvenated or the corneal lesion can be controlled to achieve vision improvement or treat certain corneal disorders. Some corneal diseases that cause patients with severe visual impairment or even blindness can be treated by corneal transplantation, helping these unfortunate patients to avoid suffering. Because the cornea itself does not contain blood vessels, it is in an "immunity pardon" status, making the success rate of corneal transplantation the highest among other allogeneic organ transplants. ^[1]

Corneal transplant

What are the causes of corneal transplantation? Whether it is bacteria, microbes or viruses, it can often cause destructive corneal ulcers, abnormal corneal protrusions (tapered corneal protrusions), corneal edema or turbid swelling caused by cataract surgery, and some cell aging will affect visual clarity and cornea. Healthy, some corneal disorders are inherited and may cause corneal opacities to swell and eventually lose vision.

Postoperative corneal transplantation

The cornea of these donors cannot be used for transplantation:

1. Certain infectious diseases such as AIDS, syphilis, rabies, tetanus, leprosy, diphtheria, viral hepatitis, encephalitis, polio, etc .;

2. Malignant tumors have invaded eye tissues and leukemia, Hodgkin's disease, etc .;

3. Certain ocular diseases such as anterior segment malignant tumors, retinoblastoma, viral keratitis, corneal degeneration or scars, glaucoma, iridocyclitis, suppurative endophthalmitis, and those who have undergone internal eye surgery.

What are the diagnostic methods of corneal transplantation? There is no relevant information for the diagnosis of corneal transplantation.

There are five complications of corneal transplantation:

1. Rejection: All organizations that transplant others may have rejection;

2. Various eye infections;

3. Glaucoma;

4. Loosening of corneal sutures;

5. Postoperative refractive error.

What are the methods of corneal transplantation?

1. The size of the ring drill should be appropriate. It is necessary to consider removing the lesion as much as possible and reducing postoperative complications. If the ring drill exceeds 8mm, it is easy to produce a rejection reaction, which is too small and the optical effect is poor.

2. To protect the corneal endothelium of the donor, the implants under drilling should have the endothelial side facing up and a drop of normal saline or healon on the endothelial side to prevent drying.

3. When drilling and implanting the bed, the ring drill should be perpendicular to the corneal surface, and the implant bed will tilt, which will affect healing. Do not use too much force when drilling, otherwise it will easily damage the iris and lens. After penetrating to a certain part, use corneal scissors Better. If possible, a little healon can be injected into the anterior chamber, which is more conducive to surgery.

4. The suture should be properly aligned. The suture depth is 4/5 of the entire corneal layer, and the distance between each needle should be as uniform as possible to reduce astigmatism.

5. The formation of the anterior chamber during the operation is particularly important. Watertightness is preferred, followed by airtightness. If the anterior chamber cannot be formed, find the cause, such as air leakage and water leakage, to strengthen the suture.