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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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By PanEris
using Melati.
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