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Glaucoma is a group of eye disorders in which the optic nerves connecting the eyes and the brain are gradually impaired. When the condition develops before the age of 40, it may be termed "early-onset glaucoma" is used. Increased pressure inside the eyes has caused the optic nerve damage in those people with glaucoma. Eye pressure increases as a result of structural abnormalities that hinder fluid drainage. Primary congenital glaucoma occurs before the age of 3 in the absence of other underlying abnormalities. Primary open-angle glaucoma, the most common adult form of glaucoma, is seen early in life by some people. If primary open-angle glaucoma emerges during childhood or early adulthood, it is called juvenile open-angle glaucoma.
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