diopter.
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.
Meaning & usage
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.
The dioptre adjustment mechanism of a pair of binoculars or of a camera viewfinder.
A lens element attached to the front of a photographic lens to shorten the lens's minimum focus distance; also called a "close-up filter".
Any lens system, such as a telescope.
A theodolite or similar surveyor’s angle measuring device.
An alidade.
A surgical speculum.
An instrument for drawing the skull by projections.
Where this word comes from
From Latin dioptra, from Ancient Greek διόπτρα (dióptra).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.