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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 ?
The approved device allows correction of up to 2 diopters of post-operative sphere and/or -0.
Also offered are new lens colors and shades, as well as magnifying readers with diopters of +1.
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).
Along with relieving the eyes and headache, it gradually decreased diopters.
58 prism Diopters and 3 months the mean deviation was 5.
He adds that myopic maculopathy typically affects patients who have at least -6 diopters of nearsightedness with an axial length of greater than 26 millimeters.
The rings adjust for the sharpest image possible in a range of +2 to -6 diopters.
You're a candidate for LASIK if your eyes are healthy, you've had a stable eyeglass prescription for at least two years and your vision is within a correctable range (no more than -12 diopters for myopia and +6 diopters or less for hyperopia).
Equipped with a distortion-free magnification of 5 diopters (2.
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.