Glaucoma is a threat to vision because it involves a/an:

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Glaucoma involves the increase in intraocular pressure that can gradually damage and destroy structures in the eye, especially the optic nerve. This pressure damages the delicate fibers that make up the optic nerve and eventually leads to vision loss. A build-up of protein molecules in the lens is a characteristic of cataracts, while the deterioration of the macula due to abnormal blood vessel growth is a hallmark of age-related macular degeneration. Inflammation of the optic nerve due to increased intracranial pressure is a condition known as papilledema.

Glaucoma Is a Threat to Vision Because It Involves A/an