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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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