diopter


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di·op·ter

 (dī-ŏp′tər)
n.
A unit of measurement of the refractive power of lenses equal to the reciprocal of the focal length measured in meters.

[Obsolete diopter, an instrument for measuring angles, from Latin dioptra, from Greek dioptrā : dia-, dia- + optos, visible; see okw- in Indo-European roots.]

di·op′tral (-trəl) adj.

di•op•ter

(daɪˈɒp tər)

n.
a unit of measure of the refractive power of a lens, having the dimension of the reciprocal of length and a unit equal to the reciprocal of one meter. Abbr.: D
Also, esp. Brit.,di•op′tre.
[1585–95; < Latin dioptra < Greek: instrument for measuring height or levels =di- di-3 + op- (for ópsesthai to see) + -tra n. suffix of means]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.diopter - 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
unit, unit of measurement - any division of quantity accepted as a standard of measurement or exchange; "the dollar is the United States unit of currency"; "a unit of wheat is a bushel"; "change per unit volume"
Translations
dioptrie

di·op·ter

, dioptre
n. dioptría, unidad de medida de refracción de un lente.

diopter

n dioptría
References in periodicals archive ?
An accurate image could not be taken without a 90 diopter lens (Figure 4).
50 diopters of astigmatism, gender and age (two groups less and equal to 25 years at operation time and above 25 years at operation time).
The binocular tube inclined at 45[degrees] features a diopter and variable adjustments for inter-pupillary use.
Sig Sauer, a leader in commercial, law enforcement, and military firearms manufacture, has introduced a rotary diopter sight system that is optimized for the SIG 556 rifle and provides serious shooters with a high-quality set of iron sights with CQB capabilities.
To meet the needs of an aging workforce, company offers two styles of bifocal safety eyewear, each in four diopter strengths: 1.
The diopter adjustment rings on eyepieces of the AN/AVS-6 series, AN/PVS7B or -7D and AN/PVS-14 let you focus your NVD even if you normally wear glasses.
A day-to-night offset of 1/2 or 3/4 diopter * is typical, says Bowen, who prescribes night-driving glasses for some patients.
During a recent visit, he covered the doors and windows of one of its small ground-floor rooms with dark plastic, then installed a small circular opening and a diopter lens.
The 216-piece deluxe floor display, 144-piece slim-line floor display and 72-piece counter unit present glasses grouped by diopter in differently colored areas.
Other Fujinon innovations include a centerline diopter adjustment.