Difference between revisions of Diopters

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-10.00+ - Very high myopia. Field of view significantly reduced.
-10.00+ - Very high myopia. Field of view significantly reduced.
Diopters are calculated by the formula D=1/f where f is the distance in meter to blur.
If you can see 50cm clearly your diopters will be 1/0.5=2 diopters.

Revision as of 12:04, 22 May 2020

Diopters is a measure of the power of a lens (or mirror). It is equal to 1/focal length in meters. In EM we refer to the cm measurement to calculate diopters needed to correct refraction of the eye.

A lens with a negative diopter sign compensates for nearsightedness while a lens with a positive diopter sign compensates for farsightedness

Approximate categorizations of myopia by lens power:

0.00 - -0.75 - Probably don't need glasses

-1.00 - -2.00 - Mild myopia, no differentials needed

-2.00 - -5.00 - Moderate myopia, glasses always needed

-5.00 - -10.00 - High myopia

-10.00+ - Very high myopia. Field of view significantly reduced.

Diopters are calculated by the formula D=1/f where f is the distance in meter to blur.

If you can see 50cm clearly your diopters will be 1/0.5=2 diopters.