The cornea is the clear tissue that covers the colored part of the eye. Light passes through to reach the retina, giving sight. Genetic conditions, illness or injury may result in scarring or clouding of the cornea that can result in vision impairment or blindness. Donated cornea tissue may be used to restore vision.
The sclera is the white part of the eye. Scleral grafts may be used when someone suffers an injury or has a blind, painful eye. Sight is not restored through a scleral implant, but quality of life is enhanced.