Optic /(ŏp"tĭk)/

Op·tic

Optic

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

Optic

a.
  1. Of, pertaining to, or using vision or sight; as, optical illusions.
    The moon, whose orb Through optic glass the Tuscan artist views.
  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.
  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.