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O  ›  optic
O  ›  optic
1828 Definition

OP'TIC,'TICAL, a. [Gr. from to see, the eye.]

1. Relating or pertaining to vision or sight.

2. Relating to the science of optics.

Optic angle, is that which the optic axes of the eyes make with one another, as they tend to meet at some distance before the eyes.

Optic axis, is the axis of the eye, or a line going through the middle of the pupil and the center of the eye.
1913 Definition
Optic (optic)
n.(?)
Op"tic
[From Optic, a.]
  1. The organ of sight; an eye.

    The difference is as great between
    The optics seeing, as the object seen.
    Pope.

  2. An eyeglass.
    [Obs.] Herbert.
  3. Of or pertaining to vision or sight.

    The moon, whose orb
    Through optic glass the Tuscan artist views.
    Milton.

  4. 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.
  5. 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.


1828 dictionary
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