Definitions from Wiktionary (diopter)

▸ noun:  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.
▸ noun:  The dioptre adjustment mechanism of a pair of binoculars or of a camera viewfinder.
▸ noun:  (photography, dated) A lens element attached to the front of a photographic lens to shorten the lens's minimum focus distance; also called a "close-up filter".
▸ noun:  (obsolete) Any lens system, such as a telescope.
▸ noun:  (obsolete) A theodolite or similar surveyor’s angle measuring device.
▸ noun:  (obsolete) An alidade.
▸ noun:  (obsolete) A surgical speculum.
▸ noun:  (obsolete) An instrument for drawing the skull by projections.






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