Definition of Optic

Op´tic   Pronunciation: ǒp´tĭk
n.1.The organ of sight; an eye.
The difference is as great between
The optics seeing, as the object seen.
- Pope.
2.An eyeglass.
a.1.Of, pertaining to, or using vision or sight; as, optical illusions.
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; the optic (or optical) axis of the eye. See Illust. of Brain, and Eye.
3.Relating to the science of optics or to devices designed to assist vision; as, optical works; optical equipment.
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
a - (Opt.) 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.


Related Words

baby blues, banjo eyes, bright eyes, clear eyes, cornea, eye, eyeball, eyelid, goggle eyes, iris, lens, lid, naked eye, nictitating membrane, ocular, oculus, ophthalmic, ophthalmologic, optic nerve, optical, optometrical, orb, organ of vision, peeper, popeyes, pupil, retina, saucer eyes, sclera, seeing, starry orbs, unaided eye, visible, visional, visual, visual organ

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