1) Ancient astronomy device 2) Unit 3) Unit of measurement 4) Used by oculists
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• (n.) Alt. of Dioptra
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http://thinkexist.com/dictionary/meaning/diopter/
(from the article `Heron of Alexandria`) ...not by Heron in their present form, and the sixth consists largely of extracts from the first. Akin to these works is the Dioptra, a book on land ... ...and angles not otherwise measurable. Triangulation was used by the ancient Egyptians, Greeks, and other peoples at a very early date, with cr...
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http://www.britannica.com/eb/a-z/d/52
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 ... [3 related articles]
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http://www.britannica.com/eb/a-z/d/52
(Digital cameras and photo printers) Unit for measuring a lens` refractive power. In photography, the term is used with close-up lenses and corrections to the viewfinder to adjust it to the user`s eyesight.
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http://www.encyclo.co.uk/local/20472
<microscopy> An optical unit representing the reciprocal of the focal length (in metres) of a lens, in terms of the metre. A 1 diopter lens has a focal length of 1 metre, a 2-diopter lens has a focal length of 1/2 metre, etc. The diopter expresses the power as in spectacles or other weak lenses. ... (05 Aug 1998) ...
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http://www.encyclo.co.uk/local/20973
(di-op´tәr) a unit of refractive power of lenses: the reciprocal of the focal length in meters is the refractive power in diopters. Symbol D.
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http://www.encyclo.co.uk/local/21001
Optical term for the power of a lens. Photographically, it is typically used to indicate the magnification and focal length of close-up lenses
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http://www.encyclo.co.uk/local/21048
Di·op'ter Di*op'tra noun [ Latin dioptra , from Greek .... See 2d Dioptric .] An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc.
Found on http://www.encyclo.co.uk/webster/D/69
(D) (di-AHP-tur) Unit to designate the refractive power of a lens
Found on http://www.eyeglossary.net/
(D) Type: Term Pronunciation: dī-op′tĕr Definitions: 1. The unit of refracting power of lenses, denoting the reciprocal of the focal length expressed in meters.
Found on http://www.medilexicon.com/medicaldictionary.php?t=24993
Optical term for the power of a lens. Photographically, it is typically used to indicate the magnification and focal length of close-up lenses.
Found on http://www.rodsmith.org.uk/photographic%20glossary/rods%20photographic%20gl
the measure of lens strength. =1/(focal length in metres)
Found on http://www.trayner.co.uk/Info/Glossary.html
Close-up lenses (which screw into the front of an existing lens and act like a reading glass) are often marked in 'diopters' (2.5 diopter close-up lens) The diopter value of a lens is calculated by taking the reciprocal of the focal length expressed in meters. Each diopter is the number of times the focal length of the lens will divide into one met...
Found on https://www.encyclo.co.uk/local/20176
dioptre noun 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
Found on https://www.encyclo.co.uk/local/20974
The diopter is part of the viewfinding system of a camera that can be adjusted to compensate for your own particular eyesight, allowing you to see the groundglass clearly.
Found on https://www.encyclo.co.uk/local/21112
a unit of measure of the refractive power of a lens, having the dimension of the reciprocal of length and a unit equal to the reciprocal of one meter. Abbr.: D · an instrument, invented by Hipparchus, to measure the apparent diameter of the sun or moon or to estimate the size or elevation of distant objects.
Found on https://www.infoplease.com/dictionary/diopter
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