Dioptric /(?)/

Di·op·tric

Dioptric

a.
  1. Of or pertaining to the dioptre, or to the metric system of numbering glasses. (Optics)

Dioptric

a.
  1. Of or pertaining to dioptrics; assisting vision by means of the refraction of light; refractive; as, the dioptric system; a dioptric glass or telescope.

Phrases & Compounds
Dioptric curve
a Cartesian oval. See under Cartesian.