Glaucoma usually develops in the middle-aged or elderly and is the most common cause of blindness. Visual loss usually starts at the periphery and gradually encroaches upon central vision. Damage to the nerve fibers can begin up to six years before symptoms become noticeable, by which time the damage can be significant. While there is no known cure, glaucoma can be managed through early detection and treatment with eyedrops.
A gene has been discovered for one of the rarer forms of glaucoma.
Glaucoma occurs most commonly in people over the age of 60. It tends to run in families. Anyone over 40, nearsighted people, diabetics, blood relatives of glaucoma patients, steroid users, smokers and people who have previously injured their eyes have the highest risk of contracting glaucoma. The incidence of glaucoma is rising as the population ages. People of African extraction are 3 to 6 times as likely as whites to develop glaucoma and the disease is the leading cause of irreversible blindness in blacks. Blacks tend to develop the disease about 10 years earlier than whites.
2. The current ophthalmic standard tests for eye pressure are not sufficient to diagnose glaucoma. It is important also to look directly at the optic nerve after pupil dilation, and a test of the person's peripheral vision is needed. It is advisable to check for glaucoma at ages 35 and 40, and then every 2 or 3 years until 60.