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For other uses, see Diopter (disambiguation). A dioptre (uk), or diopter (us), is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (that is, 1/metres). It is thus a unit of reciprocal length. For example, a 3-dioptre lens brings parallel rays of light to focus at 1â3 metre.
The established allowable norm used by many eye doctors is two diopters (a unit that expresses the power of a lens). This means that one eye may normally aim about 1/4 inch lower at reading distance than the other eye. This is a large amount. In comparison, behavioral optometrists use 1/2 diopter as the allowable norm.