Dioptre
Part of speech: noun
Definition: A unit of measure of the power of a lens or mirror, equal to the reciprocal of its focal length in meters. Myopia is diagnosed and measured in diopters.
Diopter
Part of speech: noun
Definition: A unit of measure of the power of a lens or mirror, equal to the reciprocal of its focal length in meters. Myopia is diagnosed and measured in diopters.Any lens system, such as a telescopeA theodolite or similar surveyor's angle measuring deviceAn alhidadeA surgical speculumAn instrument for drawing the skull by projections.