2 definitions found
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Optic \Op"tic\, Optical \Op"tic*al\, a. [F. optique Gr ?; akin
to ? sight, ? I have seen, ? I shall see and to ? the two
eyes, ? face, L. oculus eye. See {Ocular}, {Eye}, and cf
{Canopy}, {Ophthalmia}.]
1. Of or pertaining to vision or sight.
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}.
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
{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.
From WordNet r 1.6 [wn]:
optical
adj 1: of or relating to or involving optics; "optical supplies
2: relating to or using sight; "ocular inspection"; "an optical
illusion"; "visual powers"; "visual navigation" [syn: {ocular},
{optic}, {visual}]
3: 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" [syn: {ocular},
{optic}, {opthalmic}]
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