Diopter (disambiguation)

In modern usage, diopter or dioptre is a measure of the refractive power of an optical system.

Look up diopter in Wiktionary, the free dictionary.

Diopter may also refer to:

Historically, a dioptric lens
Any lens system, such as a telescope
A diopter sight
A close-up lens used in photography
A theodolite or similar surveyor's angle measuring device
A dioptra, an old surveying device
An alidade
A surgical speculum
An instrument for drawing the skull by projections

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