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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations
dioptrie

di·op·ter

, dioptre
n. dioptría, unidad de medida de refracción de un lente.
English-Spanish Medical Dictionary © Farlex 2012

diopter

n dioptría
English-Spanish/Spanish-English Medical Dictionary Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
References in periodicals archive ?
Caption: The locking diopter allows the shooter to focus the reticle and secure it in place.
Surgically induced astigmatism was calculated using online SIA calculator for both groups and residual astigmatism was calculated by subtracting post operative from pre operative diopter of astigmatism.
Peli Press-on Prisms, which are available in 40 diopter and 57 diopters, are made up of two Fresnel strips that are fitted 9 to 12 mm apart above and below the pupil.
The sights of the C93 consist of a front, fixed, hooded post and a HK-type rotating diopter rear sight.
Mean myopia progression increased by 0.38 diopter for the 0.25%A group, 0.15 diopter for the 0.5%A group and 0.21% diopter for the 0.25%A+E group.
To meet the needs of an aging workforce, company offers two styles of bifocal safety eyewear, each in four diopter strengths: 1.0, 1.5, 2.0, and 2.5.
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.
Because the vision in your left eye may differ from that in your right, you match each barrel to the eye with a diopter ring, traditionally on the right-hand barrel.
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.
"You can be 20 feet away and see the different colors corresponding to the 1.25 or 3 diopter, or the 2.75 or 2.5.
The available loupes are +2, +3, and +5 diopter. Since the loupes are attached to the headband, the Model 1235-B eliminates the need for dedicated prescription lenses.