 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. The pupil 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 layers including the rods and cones.
| MACULA: | Small, specialized central area of the retina responsible for acute central vision. |
VITREOUS: |
Transparent, colorless, gelatinous mass that fills the rear two-thirds of the interior of the eyeball.
| OPTIC NERVE: | Carries visual information for sight from the retinal to the brain. |
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