diopter (D)

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Introduction

The units of refracting power of lenses. It is equal to the recprocal of the focal length of the lens in meters.

A 1 diopter lens has a focal length of 1 meter.

A 2 diopter lens has a focal length of 0.5 meters.

References

  1. ↑ Stedman's Medical Dictionary 27th ed, Williams & Wilkins, Baltimore, 1999
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