Definition: optical

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Source: WordNet (r) 1.7 

optical
     adj 1: relating to or using sight; "ocular inspection"; "an optical
            illusion"; "visual powers"; "visual navigation" [syn:
            ocular, optic, visual]
     2: of or relating to or involving light or optics; "optical
        supplies
     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]

Source: Webster's Revised Unabridged Dictionary (1913) 

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.