Diopter

usgb/daɪˈɑːptər/
noun

A unit of measurement for the optical power of a lens, equal to the reciprocal of the focal length in meters.

The eye doctor said I need lenses with a strength of -2.5 diopters.
Visual representation of "diopter" - A unit of measurement for the optical power of a lens, equal to the reciprocal of the focal length in meters.

Often appears as...

  • high diopters
  • negative diopters

Usage tips

Neutral

optical power, corrective lenses, lens strength

Definition 1 of 1
Visual representation of "diopter"
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Measurement

Diopters measure the optical power of lenses; higher values indicate stronger lenses.

Illustration for Measurement
My new glasses have a prescription of -3 diopters.
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Context

In medical contexts, diopter is crucial for visual correction; it's essential to understand your prescription.

Illustration for Context
I learned that my vision is corrected best with a diopter of -2.75.
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Technical Use

Diopter is used primarily in optics; familiarity with this term is necessary for anyone purchasing corrective lenses.

Illustration for Technical Use
I didn't understand diopters until I started wearing glasses.
Visual representation of the word "Diopter"

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