Corneal Transplants
If you have severe damage to your cornea (the clear front layer of your eye), doctors can replace the damaged part with healthy corneal tissue from a donor.
If you have scarring or other damage that affects the whole cornea, doctors can do a full thickness corneal transplant (called a penetrating keratoplasty). If only part of your cornea is damaged, doctors can do a partial thickness transplant (called a lamellar keratoplasty).
Source: National Eye Institute (NEI)