ˈdaɪ.əʊ.praɪ

Definitions

1. noun

The unit of measurement for the refractive power of a lens, equal to the reciprocal of the focal length in metres.

“The dioptre is a crucial measurement in designing corrective lenses.”

2. noun

A unit of refractive power used to measure the optical power of a lens.

“A 1 dioptre lens is used to correct nearsightedness.”