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prism diopter

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prism diopter

–noun Optics.
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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Medical Dictionary

Main Entry: prism diopter
Function: noun
: an arbitrary standard of prismatic deflection equal to that of a prism that deflects a beam of light one centimeter on a planeplaced at a distance of one meter
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

prism diopter n.
Abbr. PD
The unit measuring the deflection of light passing through a prism equal to a deflection of 1 centimeter at a distance of 1 meter.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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