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|  | | Lens strength
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|  | | |  Focal length and lens power (measured in diopters) are reciprocal measurements. This calc allows conversion in either direction, by the use of the units menu.
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| | |  Occasionally, other quantities (such as spherical curvarure) are also measured in diopters. This calc may also be used under these circumstances. | | ||||||
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© Andy & Steve Shipway 2008