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What is diopter?

Galina Mirzahmedova
Galina Mirzahmedova
January 25, 2015
What is diopter?

When glasses or lenses are prescribed to patients with visual acuity disorders, they may be interested in what diopter is. And it is even more important to know what diopters are involved in the recipe for making glasses or lenses.

Diopter is a physical concept, which refers to the optical power of any axisymmetric optical system, most often - lenses. In abbreviated form, this unit of measurement is commonly referred to as “diopter”. One diopter is equivalent to the optical power of a system that has an optical distance of one meter.

Diopters can be characterized by human vision. If a person sees well, it is customary to determine the natural optical power of the eye with the number zero. In the case, if a person is short-sighted or far-sighted, his vision is denoted, respectively, by negative (“minus”) or positive (“plus”) values ​​(diopters) - this is the optical power of the external lens (glasses) that should compensate for the lack of strength lens of the eye.

The word can be used, for example, in such a sentence: "He had poor eyesight, and he wore glasses with minus five diopters."


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