The Collaborative International Dictionary of English v.0.48:

Scioptic \Sci*op"tic\, a. [Gr. ? shadow + ? belonging to sight:
   cf. F. scioptique. See Optic.] (Opt.)
   Of or pertaining to an optical arrangement for forming images
   in a darkened room, usually called scioptic ball.
   [1913 Webster]

   Scioptic ball (Opt.), the lens of a camera obscura mounted
      in a wooden ball which fits a socket in a window shutter
      so as to be readily turned, like the eye, to different
      parts of the landscape.
      [1913 Webster]