Cataract surgery is the removal of the natural lens of the eye that has developed an opacification, which is referred toas a cataract.
Glaucoma is a group of eye diseases which result in damage to the optic nerve and vision loss. The most common type is open-angle glaucoma with less common types.
The cornea is a clear layer that covers the front of the eye. It helps the eye focus, and keeps out germs and dust. This is a diseases of the cornea.