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prism diopter

   Also found in: Dictionary/thesaurus, Encyclopedia 0.03 sec.
diopter /di·op·ter/ (di-op´ter) a unit for refractive power of lenses, being the reciprocal of the focal length expressed in meters; symbol D.
prism diopter  a unit of prismatic deviation, being the deflection of 1 cm. at a distance of one meter; symbol Δ.
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.


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