01 n. The production of an optogram on the retina by the photochemical action of light on the visual purple; the fixation of an image in the eye.…
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The production of an optogram on the retina by the photochemical action of light on the visual purple; the fixation of an image in the eye. The object so photographed shows white on a purple or red background. See Visual purple, under Visual.(Physiol.) See: Visual