Definition of Opticel

{ Op"tic (?), 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.

Of, or relating to sight; visual
Strabismus is an optical defect
Designed to assist or enhance sight
A microscope is an optical instrument
Of, or relating to optics
Refraction is an optical effect
Of, or relating to visible light
Optical telescopes don't work when it is cloudy
Incorporating light-sensitive devices
An optical switch opens the door automatically

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