Optic — Defs

01 n. The organ of sight; an eye.

1.
The organ of sight; an eye.
“The difference is as great between The optics seeing, as the object seen.” — Pope.
2.
An eyeglass.[Obs.]

02 a. Of, pertaining to, or using vision or sight; as, optical illusions.

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. See Illust. of Brain, and Eye. See: Brain, Eye
3.
Relating to the science of optics; as, optical works.

Phrases & compounds

Optic angle — the angle included between the optic axes of the two eyes when directed to the same point; -- sometimes called binocular parallax.

Optic axis — 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.

Optical circle — 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.