optogram

Noun

1. An image of external objects fixed on the retina by the photochemical action of light on rhodopsi.
   • The bleaching of visual purple is limited to the area exposed to light, so that an optogram or image of the luminous object, such as a window, can be obtained. - 1924, John Herbert Parsons, An Introduction to the Study...
   • The study of optograms caught the imagination of the public as well as the scientific community. Some scientifically minded sleuths hoped that the optograms of murder victims might betray their killers! - 2001, Stanley...
   • What Dantin, Ginory, and Bernardet do not know—that is, the true facts about the killer's identity and the source of Dantin's image—will come not from the material evidence of the optogram, but from the vagaries of...