Optic

Adjective

 * Of, or relating to the eye or to vision.
 * Of, or relating to optics or optical instruments.

Noun

 * 1)  An eye.
 * 2) A lens or other part of an optical instrument that interacts with light.
 * 3) A measuring device with a small window, attached to an upside-down bottle, used to dispense alcoholic drinks in a bar.

Thesaurus
baby blues, banjo eyes, bright eyes, clear eyes, cornea, eye, eyeball, eyelid, goggle eyes, iris, lens, lid, naked eye, nictitating membrane, ocular, oculus, ophthalmic, ophthalmologic, optic nerve, optical, optometrical, orb, organ of vision, peeper, popeyes, pupil, retina, saucer eyes, sclera, seeing, starry orbs, unaided eye, visible, visional, visual, visual organ