diopter ( synonym found)
Definition 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.
°(obsolete) Any lens system, such as a telescope.
Definition 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.
°(obsolete) Any lens system, such as a telescope.
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