Ocular Anatomy

Cornea - clear window at the front of the eye

Third eyelid and gland - the third eyelid is raised protectively and has a tear gland

Iris - colored part of the eye that constricts with light

Lens - focuses light onto the back of the eye (on the retina).  Cataracts may form in this location

Retina - rods, cones and nerve layer of the eye that converts light into an signal that is transmitted to the brain for vision

Tapetum - the reflective area that reflects light through the  through the retina ("eye-shine" at night like a deer caught in headlights).  People and some primates do not have this area of the eye.

Non-tapetum - the pigmented area of the retina

Choroid - blood vessels that supply nutrients to the eye and reflective cells that give the tapetum color

Optic nerve - carries visual information to the brain