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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.
Abbr. sph A lens in which all refracting surfaces are spherical. For example, the central section may consist of a spherical lens ground with annular rings. Fig. 376 represents a spherical lens with a curved surface coinciding with that of a sphere whose center is at C.