PHOSPHENE

Etymology

Noun

phosphene (plural phosphenes)

A sensation of lights caused by mechanical or electrical (rather than optical) stimulation of the retina.

Source: Wiktionary

Phos"phene, n. Etym: [Gr. (Physiol.)

Definition: A luminous impression produced through excitation of the retina by some cause other than the impingement upon it of rays of light, as by pressure upon the eyeball when the lids are closed. Cf. After- image.

Source: Webster’s Unabridged Dictionary 1913 Edition