What is glaucoma?
Glaucoma is an eye disease that may cause loss of vision. It occurs as a result of changes in the optic nerve. Pressure from a buildup of fluid in the eyeball is a major risk factor for glaucoma. Normally, this fluid nourishes your eye and keeps it healthy. After the fluid circulates, it empties through a drain in the front of your eye. In people who have glaucoma, the drain in the eye is blocked and the fluid can't run out of the eyeball. Instead, the fluid builds up and causes increased pressure in the eye.
Written by familydoctor.org editorial staff