After-image

(redirected from Hess after-image)
Also found in: Medical.

Aft´er-im`age


n.1.The impression of a vivid sensation retained by the retina of the eye after the cause has been removed; also extended to impressions left of tones, smells, etc.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.