What is the meaning 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.
The dioptre adjustment mechanism of a pair of binoculars or of a camera viewfinder.
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".
Any lens system, such as a telescope.
A theodolite or similar surveyor’s angle measuring device.
An alidade.
An instrument for drawing the skull by projections.
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