Of or pertaining to the eye; ophthalmic; optic: as, ocular movements; the ocular (optic) nerve.Depending on the eye; known by the eye; received by actual sight or seeing; optical; visual: as, ocular proof; ocular demonstration or evidence.In entomology, pertaining to the compound eyes: distinguished from ocellar.n. In optics, the eyepiece of an optical instrument, as of a telescope or microscope. See eyepiece.n. Something which is conveyed to the mind through actual sight.n. The eye.n. In Echinoidea, an ocular plate.