optically positive

From The Collaborative International Dictionary of English v.0.48:

Optically \Op"tic*al*ly\, adv.
   1. By optics or sight.
      [1913 Webster]

   2. With reference to optics.
      [1913 Webster]

   Optically active, Optically inactive (Chem. Physics),
      terms used of certain isomeric substances which, while
      identical with each other in other respects, differ in
      this, viz., that they do or do not produce right-handed or
      left-handed circular polarization of light. See {optical

   Optically positive, Optically negative. See under
      [1913 Webster]
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