Diopter Definition

dī-ŏptər
diopters
noun
diopters
A unit of measure of the power of a lens, equal to the power of a lens with a focal length of one meter.
Webster's New World
Synonyms:
  • dioptre

Other Word Forms of Diopter

Noun

Singular:
diopter
Plural:
diopters

Origin of Diopter

  • Obsolete diopter an instrument for measuring angles from Latin dioptra from Greek dioptrā dia- dia- optos visible okw- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From French dioptre, from Latin dioptra, from Greek διοπτρα (dioptra, “to see through”).

    From Wiktionary

Diopter Sentence Examples

  • In addition, there is no diopter correction to help focus the image for those of us with less than perfect vision.

  • Over-the-counter reading glasses can typically be found in diopter strengths up to 3.0, though not all styles will be available in all strengths.

  • The chart at Visacuity can help you determine the diopter strength that you need.

  • To the right is the viewfinder with a rubber eyecup, under which is a Diopter adjustment knob.

  • A diopter correction knob, located on the side of the EVF, is used to focus the image on the screen.

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