dioptric

adj

1. Acting as a medium for sight; making use of refraction (of lenses, etc.).
2. (obsolete)Pertaining to a diopter.

   “[W]ould the new Narcissus—without any dioptric or sciatherical computing—grasp the alternating skirmish of light and shadow.”

3. (obsolete)Capable of being seen through.

noun

1. (in-plural)The branch of optics concerned with refraction.
2. A dioptric telescope.