|CORNEA:||Transparent front segment of the eye that covers iris, pupil, and |
anterior chamber, and provides most of an eye's optical power.
|PUPIL:||Variable-sized, circular opening in center of iris; it appears as a |
black circle and it regulates amount of light that enters the eye.
|IRIS:||Pigmented tissue lying behind cornea that (1) gives color to eye, and|
(2) controls amount of light entering eye by varying size of black
pupillary opening; separates the anterior chamber from the posterior chamber.
|LENS:||Natural lens of eye; transparent intraocular tissue that helps bring|
rays of light to focus on the retina.
|RETINA:||Part of the eye that converts images into electrical impulses sent|
along the optic nerve for transmission back to the brain. Consists of
many named layers that include rods and cones.
|MACULA:||Small, specialized central area of the retina responsible for acute|
|VITREOUS:||Transparent, colorless, gelatinous mass; fills rear two-thirds |
of the interior of the eyeball, between the lens and the retina.
|OPTIC NERVE:||Largest sensory nerve of eye; carries impulses for sight from |
retina to brain.