optical

Adjective

WordNet 3.0

Adjective (3)

of or relating to or involving light or optics“optical supplies”
relating to or using sight“ocular inspection”“an optical illusion”“visual powers”“visual navigation”Synonyms: ocular optic visual
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 optic opthalmic

Webster's Dictionary (GCIDE)

Optic \Op"tic\ ([o^]p"t[i^]k), Optical \Op"tic*al\ ([o^]p"t[i^]*kal), a. [F. optique, Gr. 'optiko`s; akin to 'o`psis sight, 'o`pwpa I have seen, 'o`psomai I shall see, and to 'o`sse the two eyes, 'o`ps face, L. oculus eye. See Ocular, Eye, and cf. Canopy, Ophthalmia.]

1.Of, pertaining to, or using vision or sight; as, optical illusions. [WordNet sense 2]

Syn: ocular, optic, visual. [1913 Webster + WordNet 1.5]

The moon, whose orb Through optic glass the Tuscan artist views.— Milton.[1913 Webster]

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. [WordNet sense 3] [1913 Webster]

3.Relating to the science of optics or to devices designed to assist vision; as, optical works; optical equipment. [WordNet sense 1] [1913 Webster +PJC]

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. [1913 Webster]