Corneal is a surgical procedure it is also is also known as corneal grafting; in this procedure a damaged or diseased cornea is replaced by a donated corneal tissue. When the entire cornea is replaced and it is known as penetrating keratoplasty, when only part of the cornea is replaced it is known as lamellar keratoplasty. Keratoplasty simply means surgery to the cornea. A cornea surgery is one of the surgical procedures to replace a part of your cornea with healthy corneal tissue to help and improve your eye vision. Your cornea is the transparent, dome-shaped surface of your eye that accounts for a large part of your eye's focusing power. The human cornea is composed of three layers, first is the outer or epithelial layer, second is the middle or stromal layer and third is the inner or endothelial layer. The endothelial layer is composed of a single layer with thousands of small pump cells which are responsible for pumping fluid out of the cornea so it can remain clear and thin and provide good vision for the eye. A corneal surgery can restore vision, reduce pain and improve the appearance of a damaged or diseased cornea.