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

Glaucoma is a threat to vision because it involves a/an ________.

A) buildup of protein molecules in the lens that gradually block light rays
B) deterioration of the macula as abnormal blood vessels grow under it
C) increase in intraocular pressure that gradually destroys peripheral vision
D) inflammation of the optic nerve due to increased intracranial pressure