Cornea is eye’s clear protective outer layer, along with sclera (the white portion of eye), which serves as a barrier against dirt, germs and other things that can cause damage. If the cornea is damaged by disease, infection, or injury, the resulting scars can effect the vision, which is commonly called as corneal blindness. Corneal blindness can be treated by corneal transplantation, also known as corneal grafting. It is a surgical procedure where a damaged or deceased cornea is replaced by donated tissue. When the cornea is replaced it is known as penetrating keratoplasty and where only part of the cornea is replaced it is known as Lamellar Keratoplasty.