The Collaborative International Dictionary of English v.0.48:

Catoptric \Ca*top"tric\, Catoptrical \Ca*top"tric*al\, a. [Gr.
   ?. See Catopter.]
   Of or pertaining to catoptrics; produced by reflection.
   [1913 Webster]

   Catoptric light, a light in which the rays are concentrated
      by reflectors into a beam visible at a distance.
      [1913 Webster]

WordNet (r) 3.0 (2006):

catoptrical
    adj 1: of or relating to catoptrics; produced by or based on
           mirrors [syn: catoptric, catoptrical]