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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.

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. (Opt.) (a) 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.


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