diopter
Definition from Wiktionary, the free dictionary
See also Diopter
Contents |
English [edit]
Alternative forms [edit]
Etymology [edit]
From French dioptre, from Latin dioptra, from Greek διοπτρα (“to see through”).[1]
Noun [edit]
diopter (plural diopters)
- 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 alidade.
- (obsolete) A surgical speculum.
- (obsolete) An instrument for drawing the skull by projections.
Translations [edit]
unit of measure
theodolite
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alidide — see alidide
speculum — see speculum
instrument for drawing skull
