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n. A unit of measurement of the refractive power of lenses equal to the reciprocal of the focal length measured in meters.

n. 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.

n. Any lens system, such as a telescope.

n. A theodolite or similar surveyor’s angle measuring device.

n. An alidade.

n. A surgical speculum.

n. An instrument for drawing the skull by projections.

n. An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc.

n. An ancient form of theodolite.

n. The alidade or index arm of a graduated circle.

n. An instrument used in craniometry for obtaining projections of the skull.

n. A dioptric.

n. a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters; used by oculists

"A diopter is a unit of measurement that indicates the amount of correction needed to change your vision to be as close to 20/20 as possible."

dioptra   

unit    unit of measurement   

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