What is glaucoma?

Eye pressure problem: Glaucoma is an eye disorder that damages the eye’s optic nerve, which is the main nerve attached to the back of the eyeball. It usually happens when fluid builds up in the eyeball and increases the pressure inside the eye, thus damaging the optic nerve. Glaucoma is a cause of blindness for people over age 60. Blindness from glaucoma usually can be prevented with medical care.