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prism diopter

noun Optics.
  1. a unit of prismatic deviation, in which the number one represents a prism that deflects a beam of light a distance of one centimeter on a plane placed normal to the initial direction of the beam and one meter away from the prism.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

prism diopter in Medicine

prism diopter

n.
  1. The unit measuring the deflection of light passing through a prism equal to a deflection of 1 centimeter at a distance of 1 meter.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.