Wilhelm Friedrich Kühne, a professor of physiology at the University of Heidelberg, considered the eyes to be “whole photographic workshop.” On November 16, 1880 he dissected the head of an executed murderer in his dark room within minutes of the man’s death, working around the contracting muscles in the left eye socket to remove the eye and develop an image from the retina of the last thing this man saw.
He first conducted experiments on frogs and rabbits. He called the image fixed on the corpse’s retina an optogram.
Kuhne rabbit optogram (1878). Image from Wikipedia
and the College of Optometrists.