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Diopter

Unit used to express the power of a lens. It is the reciprocal of the focal length expressed in meters.

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diopter
Health care; Optometry

Unit of measure for the refractive (light-bending) power of a lens; eye care practitioners use it in eyeglass and contact lens prescriptions. A negative number refers to ...

diopter
Photography; Professional photography

unit used to express the power of a lens. It is the reciprocal of the focal length expressed in meters.

diopter
Earth science; Mapping science

A unit of measurement for the magnifying power of a lens, equal to the reciprocal of the focal length in meters. dioptric (adj. ) Containing only refractive elements (lenses ...

diopter
Science; General science

A measure of the power of a lens or a prism. The diopter (also called dioptrie) is usually abbreviated D. Its dimension is a reciprocal length, and its unit is the reciprocal of ...

diopter
Eyewear; Glasses

Unit of lens refractive power, equal to the reciprocal of the lens focus length in meters.

diopter
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A unit of measure of the refractive power if a lens. A one-diopter lens will focus parallel light rays one meter from the lens and a two-diopter lens will focus one-half of a ...

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