dioptre

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dioptre

(daɪˈɒptə) or

diopter

n
(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
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations

dioptre

, (US) diopter
nDioptrie f
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007

di·op·ter

, dioptre
n. dioptría, unidad de medida de refracción de un lente.
English-Spanish Medical Dictionary © Farlex 2012
References in periodicals archive ?
You would not believe the number of prescription orders we receive daily showing over three prism dioptres of anisometropia with no indication that it should be corrected.
They found that every additional year of education was associated with a more myopic refractive error of -0.18 dioptres per year.
Researchers at Cardiff University have found that for every additional year spent in education, there is an increase in myopic refractive error (short-sightedness) of 0.27 dioptres.
After taking account of potentially influential factors, Mendelian randomisation analyses suggested that every additional year of education was associated with more myopia (a refractive error of 0.27 dioptres a year).
* 9 (25%) patients had deviation within 10 prism dioptres on prism bar cover test.
The reciprocal is 2.32 dioptres. Rounding it to the nearest 0.25, would suggest a 2.25 dioptre correction.
The operation is recommended for short-sighted people with a prescription of -7 dioptres or worse, and for long-sighted prescriptions of more than +4 dioptres.
The University of Bristol and Cardiff University research team found that for every additional year spent in education, there was an increase in myopic refractive error of -0.27 dioptres.