GNU Collaborative International Dictionary of English

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1.       
    Optic (ŏpˈtĭk), Optical (ŏpˈtĭ‑kal),  a. [F. optique, Gr. ὀπτικός; akin to ὄψις sight, ὄπωπα I have seen, ὄψομαι I shall see, and to ὄσσε the two eyes, ὄψ face, L. oculus eye. See Ocular, Eye, and cf. Canopy, Ophthalmia.]
   1. Of, pertaining to, or using vision or sight; as, “optical illusions”. [wns=2]
   
   Syn. -- ocular, optic, visual.
   
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   The moon, whose orb
   
   Through optic glass the Tuscan artist views. Milton.
   
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   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. [wns=3]
   
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   3. Relating to the science of optics or to devices designed to assist vision; as, “optical works; optical equipment”. [wns=1]
   
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   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.
   
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