资料来源 : Webster's Revised Unabridged Dictionary (1913)

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}.