| Definitions | | diopter |
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noun
- 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.
- (obsolete) Any lens system, such as a telescope
- (obsolete) A theodolite or similar surveyor's angle measuring device
- (obsolete) An alhidade
- (obsolete) A surgical speculum
- (obsolete) An instrument for drawing the skull by projections.
Etymology: From dioptre < Latin dioptra or Greek , meaning to see through.<ref>The Compact Edition of the Oxford English Dictionary, Oxford University Press, 1971 </ref>
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Full Definition of diopter
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