Optic

n.	1.	The organ of sight; an eye. The difference is as great between The optics seeing, as the object seen. - Pope.
	2.	An eyeglass.
a.	1.	Of, pertaining to, or using vision or sight; as, optical illusions. The moon, whose orb Through optic glass the Tuscan artist views. - Milton.
	2.	Of or pertaining to the eye; ocular; as, the optic nerves (the first pair of cranial nerves) which are distributed to the retina; the optic (or optical) axis of the eye. See Illust. of Brain, and Eye.
	3.	Relating to the science of optics or to devices designed to assist vision; as, optical works; optical equipment. Optic angle (Opt.) the angle included between the optic axes of the two eyes when directed to the same point; - sometimes called binocular parallax. Optic axis a - (Opt.) A line drawn through the center of the eye perpendicular to its anterior and posterior surfaces. In a normal eye it is in the direction of the optic axis that objects are most distinctly seen. b - The line in a doubly refracting crystal, in the direction of which no double refraction occurs. A uniaxial crystal has one such line, a biaxial crystal has two. Optical circle (Opt.) a graduated circle used for the measurement of angles in optical experiments. Optical square a surveyor's instrument with reflectors for laying off right angles.

Noun	1.	optic - the organ of sight Synonyms: eye, oculus
Adj.	1.	optic - 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" Synonyms: ocular, opthalmic, optical
	2.	optic - relating to or using sight; "ocular inspection"; "an optical illusion"; "visual powers"; "visual navigation" Synonyms: optical, visual, ocular

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