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(daɪˈɒptə) or


(Units) a unit for measuring the refractive power of a lens: the reciprocal of the focal length of the lens expressed in metres
[C16: from Latin dioptra optical instrument, from Greek, from dia- through + opsesthai to see]
diˈoptral adj
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.dioptre - 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"


, (US) diopter
nDioptrie f


, dioptre
n. dioptría, unidad de medida de refracción de un lente.
References in periodicals archive ?
Along with relieving the eyes and headache, it gradually decreased diopters.
The rings adjust for the sharpest image possible in a range of +2 to -6 diopters.
An ESD "Add-X" lens is available that increases magnification up to 7 diopters.
Lake Forest, CA, announced the US Food and Drug Administration (FDA) has allowed the Phase II expansion of the clinical trial with its PermaVision intracorneal lens for the correction of hyperopia (farsightedness) up to +i6 diopters.
0 diopters of myopia at Hunkeler Vision Centers in Kansas City.
The Food and Drug Administration warned that the implants are only for mildly nearsighted people, whose vision is formally diagnosed as ``minus 1 diopters to minus 3 diopters.
0 diopters (D) of sphere with and without astigmatic refractive errors up to -6.
0 diopters as compared to the current range which starts at -5.
Therefore, the average treatment time for correcting four to five diopters of nearsightedness or farsightedness is just eight to ten seconds, about the time it takes to pour a cup of coffee.
75D with the new Hyperopic ICL and both myopic and hyperopic astigmatic patients with up to 6 diopters of astigmatism.
The addition of quarter diopters will only enhance my ability to target and provide patients the best possible outcomes with the Crystalens HD.