Transplant of limbal stem cells offers hope to patients with corneal disorders. Photo: K. GopinathanUnique capacity: A part of the eye constantly renews itself.CAN you imagine a part of your eye that constantly renews itself for the whole of your life? Half the cells are replaced every two months under normal conditions. The cells replicate fast and move across the surface at an incredible speed of 60 to 80 mm per hour. These are the properties of the Corneal epithelium — the outermost layer, or "skin" of your cornea, composed of five to six layers of specialised cells that...