diopter

Etymology
From, from.

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 or of a camera viewfinder.
 * 3)  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".
 * 4)  Any lens system, such as a telescope.
 * 5)  A theodolite or similar surveyor’s angle measuring device.
 * 6)  An alidade.
 * 7)  A surgical speculum.
 * 8)  An instrument for drawing the skull by projections.

Translations

 * Basque: dioptria
 * Catalan: diòptria
 * Czech:
 * Finnish: dioptria, diopteri
 * German:
 * Hungarian:
 * Italian:
 * Japanese: ディオプトリ
 * Macedonian: диоптрија, диоптер
 * Polish:
 * Portuguese: dioptria
 * Russian:
 * Spanish:


 * German:


 * Finnish:
 * German: