Definition of diopter
:a unit of measurement of the refractive power of lenses equal to the reciprocal of the focal length in meters
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Recent Examples of diopter from the Web
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Monoyer invented the diopter, a unit of measurement that determines the distance someone must be from a text to read it.
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Perhaps the glasses’ increasing diopters told a narrative.
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Origin and Etymology of diopter
diopter (an optical instrument), from Middle French dioptre, from Latin dioptra, from Greek, from dia- + opsesthai to be going to see — more at optic
Medical Dictionary
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
Learn More about diopter
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Britannica.com: Encyclopedia article about diopter
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