I. (ˈ)dī|äptrik adjective
also di·op·tri·cal -rə̇kəl
Etymology: dioptric from Greek dioptrikos of an optical instrument used for taking altitudes, from dioptra + -ikos -ic; dioptrical from Greek dioptrikos + English -al
1.
a. : that effects or serves in refraction of a beam of light : refractive ; specifically : that assists vision by refracting and focalizing light
a dioptric apparatus formed of dioptric prisms
the dioptric mechanism of an insect's eye
the dioptric power of a lens
b. : produced by means of refraction
the dioptric images of objects in space that are formed on the retinas of the two eyes — Otto Glasser
2. archaic : transparent
discrepancy between the dioptric certainty of the understanding and the immediate insight of the conscience — James Martineau
• di·op·tri·cal·ly -rə̇k(ə)lē adverb
II. noun
( -s )
: diopter 1, 3