image fixed on the retina
• (n.) An image of external objects fixed on the retina by the photochemical action of light on the visual purple. See Optography.
(op´to-gram) the visual image formed on the retina by bleaching of visual purple under the influence of light.
Op'to·gram noun [ Opt ic + - gram : confer French optogramme .] (Physiol.) An image of external objects fixed on the retina by the photochemical action of light on the visual purple. See Optography .