Di-ōp'trie or Di-ōp'trie-al, a.

a. [Gr. διόπτρικός, belonging to the use of the διόπτρα, from δι, for διά, through, and ὀπτεῖν, to see; Fr. dioptrique.]

1. Involving the principles of dioptries; assisting vision by means of the refraction of light. “To view the asperities of the moon through a dioptric glass.” More.
2. Relating to dioptries. “Dioptrical principles.” Nichol.