the standard unit of measurement used in vision science to describe lens strength. Lenses can be either negative to correct myopia, or positive to correct hyperopia.

abbr.: dpt.

Di*op"tre (?), n. [F. See 2d Dioptric.] Optics

A unit employed by oculists in numbering glasses according to the metric system; a refractive power equal to that of a glass whose principal focal distance is one meter.

 

© Webster 1913.

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