Word.ws English Dictionary

diopters

diopters is the plural of diopter.

Meaning of diopter

Noun

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 or of a camera viewfinder.
  3. (dated) 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. (obsolete) Any lens system, such as a telescope.
  5. (obsolete) A theodolite or similar surveyor’s angle measuring device.
  6. (obsolete) An alidade.

See all 8 meanings of diopter

Questions about diopters

What is diopters the plural of?
Diopters is the plural of diopter.

Words near diopters in the dictionary

  1. dioptase
  2. dioptases
  3. diopter
  4. diopteric aberration
  5. diopteric aberrations
  6. diopters
  7. dioptid
  8. dioptids
  9. dioptine
  10. dioptines
  11. dioptometer

Source and license

Adapted from Wiktionary: diopters (page history and authors); diopter (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “diopters.” Word.ws, https://word.ws/diopters. Based on Wiktionary, CC BY-SA 4.0.