A measure of the focal length of a mirror or lens, equal to the inverse of the focal length measured in metres. See also: Focal Length, Focal Point.
Found op http://www.diracdelta.co.uk/science/source/d/i/dioptre/source.html
Di·op'tre noun [ French 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.
Found op http://www.encyclo.co.uk/webster/D/70
<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. ... Origin: F. See Dioptric. ... Source: Websters Dictionary ... (01 Mar 1998) ...
Found op http://www.mondofacto.com/facts/dictionary?dioptre
• (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.
Found op http://thinkexist.com/dictionary/meaning/dioptre/
A dioptre, or diopter, 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 ...
Found op http://en.wikipedia.org/wiki/Dioptre
Optical unit in which the power of a lens is expressed as the reciprocal of its focal length in metres. The usual convention is that convergent lenses are positive and divergent lenses negative. Short-sighted people need lenses of power about -0.7 dioptre; a typical value for long sight is about +1....
Found op http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0020491.html
A measurement of the refractive power of a lens element, as a portion of a metre.
Found op http://www.trottersopticians.co.uk/eyecareglossary.htm
The unit of measurement of refractive power of a lens.
Found op http://eyediologyopticians.co.uk/pages/Eye-terms-explained.html
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