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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.

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Definitions

  1. n. 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.
  2. n. a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters; used by oculists
  3. 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.
  4. A unit employed by oculists in numbering glasses according tothe metric system; a refractive power equal to that of a glass whoseprincipal focal distance is one meter.
  5. n a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters; used by oculists