SINCE 1828
diopter
noun
di·op·ter
| \ dī-ˈäp-tər
, ˈdī-ˌäp-\
, ˈdī-ˌäp-\
Definition of diopter
: a unit of measurement of the refractive power of lenses equal to the reciprocal of the focal length in meters
Examples of diopter in a Sentence
Recent Examples on the Web
The same goes for the diopter that now locks to prevent your electronic viewfinder from suddenly going blurry. — Chris Welch, The Verge, "Fujifilm X-T3 review: the do-everything camera," 24 Oct. 2018 Monoyer invented the diopter, a unit of measurement that determines the distance someone must be from a text to read it. — Brett Molina, USA TODAY, "Double Doodle! Google honors teachers, inventor of the eye chart," 9 May 2017 Perhaps the glasses’ increasing diopters told a narrative. — The Washington Post, The Mercury News, "Was Jane Austen poisoned? New evidence about her death at 41," 13 Mar. 2017These example sentences are selected automatically from various online news sources to reflect current usage of the word 'diopter.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
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More Definitions for diopter
diopter
noun
di·op·ter
variants:
or chiefly British dioptre \ dī-ˈäp-tər, ˈdī-ˌäp-
\
\
Medical Definition of diopter
: a unit of measurement of the refractive power of a lens equal to the reciprocal of the focal length in meters
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