
What Are Diopters?

Unit of measurement of refractive power of lens.
Detailed Answer:
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Diopter is a unit of measurement of the refractive power of lenses or curved mirror and it is equal to the reciprocal of the focal length measured in meters.
A Diopter is a number which tells the power or focal length of a lens or mirror.
In other words,it is a unit for expressing the focusing or diverging strength of a lens or mirror and it is the reciprocal of the focal length measured in metres, for a diverging optical element it is expressed as a negative value and for a converging one it is expressed as a positive value.
This in turn can tell the farthest distance we can focus through the lens or mirror.
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