diopter
From Wiktionary, the free dictionary
See also: Diopter
Alternative forms
Etymology
From Latin dioptra, from Ancient Greek διόπτρα (dióptra).[1] (Can this(+) etymology be sourced?)
Noun
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.
- The dioptre adjustment mechanism of a pair of binoculars or of a camera viewfinder.
- (photography, dated) 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".
- (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
unit of measure
|
lens system
|
theodolite
|
alidade — see alidade
speculum — see speculum
instrument for drawing skull
References
Anagrams
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