The cornea is the dome-shaped window of the eye. It covers the iris, pupil and lens. It is responsible for 2/3 of the refractive power of the eye. A diseased cornea affects vision.
Irreversible corneal damage requiring surgical intervention, specifically, a corneal transplantation may include:
A donor corneal button is used to replace a diseased cornea. There are currently several kinds of corneal transplantation procedures: