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18.222.20.3
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From: Webster's Revised Unabridged Dictionary (1913)

 Op·tog·ra·phy n.  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.
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