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EtymologyEdit

From French dioptre, from Latin dioptra, from Ancient Greek διοπτρα (dioptra, to see through).[1]

NounEdit

diopter (plural diopters)

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

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