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phosphene

[fos-feen]
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noun Physiology.
  1. a luminous image produced by mechanical stimulation of the retina, as by pressure applied to the eyeball by the finger when the lid is closed.
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Origin of phosphene

1870–75; < French phosphène, irregular < Greek phôs light (contraction of pháos) + phaínein to show, shine
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for phosphene

phosphene

noun
  1. the sensation of light caused by pressure on the eyelid of a closed eye or by other mechanical or electrical interference with the visual system
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Word Origin

C19: from Greek phōs light + phainein to show
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

phosphene in Medicine

phosphene

(fŏsfēn′)
n.
  1. A sensation of light caused by excitation of the retina by mechanical or electrical means rather than by light, as when the eyeballs are pressed through closed lids.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.