The cornea is the normally clear, front window of the eye that covers the colored iris and round, dark pupil. If your cornea is injured or affected by disease, it may become swollen or scarred, and its smoothness and clarity may be lost. Scars, swelling or an irregular shape can cause the cornea to scatter or distort light, resulting in glare or blurry vision. If a cornea transplant is necessary, the damaged or unhealthy cornea tissue is removed and clear donor cornea tissue is put in its place.
A corneal transplant is needed if vision cannot be corrected satisfactorily with eyeglasses or contact lenses, or if painful swelling cannot be relieved by medications or special contact lenses.