diopter

名词 n.
中文释义

英文释义

名词 n.
  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". dated
  4. Any lens system, such as a telescope. obsolete
  5. A theodolite or similar surveyor’s angle measuring device. obsolete
  6. An alidade. obsolete
  7. A surgical speculum. obsolete
  8. An instrument for drawing the skull by projections. obsolete

词形变化

diopters plural dioptra alternative dioptre alternative dioptry alternative

词源

From Latin dioptra, from Ancient Greek διόπτρα (dióptra).
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