Glaucoma is a group of eye diseases causing optic nerve damage. The optic nerve carries images from the retina, which is the specialized light sensing tissue, to the brain so we can see. In glaucoma, eye pressure plays a role in damaging the delicate nerve fibers of the optic nerve. Most people don't notice these blind areas until much of the optic nerve damage has already occurred. It has been estimated that by 2020 there will be approximately 80...