Em--
phos·phene (fsfn)
n.
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.

The American Heritage® Stedman's Medical Dictionary, 2nd Edition Copyright © 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


What about after-image?