DIOPTER

diopter

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


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