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The Editors of EncyclopÃ¦dia Britannica. Diopter, in optics, unit of magnifying power of a lens or lens system. Because the power of a lens is proportional to unity (one) divided by the focal length (see lens), the power of a lens in diopters is numerically equal to 1 m divided by the focal length in metres.
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.