diopter


di·op·ter

noun \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

Origin 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
First Known Use: circa 1864

di·op·ter

noun    (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

Variants of DIOPTER

di·op·ter or chiefly British di·op·tre \dī-ˈäp-tər, ˈdī-ˌäp-\

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