diopters

noun

1
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.
2
The dioptre adjustment mechanism of a pair of binoculars.
3
Any lens system, such as a telescope.
4
A theodolite or similar surveyor’s angle measuring device.
5
An alidade.
6
A surgical speculum.
7
An instrument for drawing the skull by projections.

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