Slide show: Age-related vision problems
Illustration of the eye showing the optic nerve and optic disk
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Glaucoma is a group of diseases that are usually associated with abnormally high pressure inside the eye. This pressure can damage the millions of nerve fibers that carry visual information from your eye via the optic nerve to your brain. The optic disk is the point where the fibers from the retina meet before entering the optic nerve. As your optic nerve deteriorates, blind spots develop in your visual field. Left untreated, glaucoma can lead to irreversible blindness.

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