diopter

noun

di·op·ter | \dī-ˈäp-tər,

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

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. 2017

These 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.