The optical axis. / (crystallography, mineralogy) The direction in which a ray of light passing through a crystal does not suffer double refraction.

plural of optic axis

(anatomy) Either of a pair of passages through the orbit of the eye in the lesser wing of the sphenoid bone that is traversed by the optic nerves and ophthalmic arteries.

plural of optic foramen

Misspelling of optic chiasm.

(astronomy) a very short duration bright flash in the visible spectrum; thought to be caused by a type of supernova

A photoelastic effect produced by ultrasonic waves in a transparent material.