dioptre (0 synonym found)

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dioptry  ยท  dioptra

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Definition of dioptre:

(n) : Alternative spelling of diopter. [A unit of measure of the power of a lens or mirror, equal to the reciprocal of its focal length in meters. Myopia is diagnosed and measured in diopters.]
Definition of dioptre:

(n) : Alternative spelling of diopter. [A unit of measure of the power of a lens or mirror, equal to the reciprocal of its focal length in meters. Myopia is diagnosed and measured in diopters.]
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