definition of
optic

[1] #1 optic n. [eye, oculus] the organ of sight. wn

[2] #2 optic a. [ocular, optical, opthalmic] of or relating to or resembling the eye; "ocular muscles"; "an ocular organ"; "ocular diseases"; "the optic (or optical) axis of the eye"; "an ocular spot is a pigmented organ or part believed to be sensitive to light". wn

[3] #3 optic a. [ocular, optical, visual] relating to or using sight; "ocular inspection"; "an optical illusion"; "visual powers"; "visual navigation". wn