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Definition of Diopter
1. Noun. A unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters; used by oculists.
Definition of Diopter
1. n. An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc.
Definition of Diopter
1. a measure of refractive power [n -S] : DIOPTRAL [adj]
Medical Definition of Diopter
1.