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Dioptometers

A dioptometer is a telescopic system having an eyepiece, a reticle and an objective. The instrument measures wavefront power in diopters.

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Glossary
  • dioptometer A telescopic system having an eyepiece, a reticle and an objective. The instrument measures wavefront power in diopters.
  • diopter A unit of optical measurement that expresses the refractive power of a lens or prism. In a lens or lens system, it is the reciprocal of the focal length in meters. For example, if a lens has a focal length of 25 cm, the lens would have a power of 4...
  • diopter scale A scale located on the eyepiece focusing screw and used to measure the amount of defocusing of the eyepiece in diopters. The reciprocal of the image distance in meters is a measure of the amount of defocusing in diopters.
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