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The Collaborative International Dictionary of English v.0.48:

Optography \Op*tog"ra*phy\, n. [Optic + -graphy.] (Physiol.) 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. [1913 Webster]