prism diopter

prism diopter
(PD)
   a unit used in optics to measure the deflection of light by a prism. One prism diopter represents a deflection of 1 centimeter measured at a distance of 1 meter from the prism. Mathematically, the deflection in prism diopters is equal to 100 times the tangent of the angle through which the path of the light is bent in passing through the prism.

Dictionary of units of measurement. 2015.

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  • prism diopter — n an arbitrary standard of prismatic deflection equal to that of a prism that deflects a beam of light one centimeter on a plane placed at a distance of one meter * * * a unit of prismatic deviation; deflection of one centimeter at a distance of… …   Medical dictionary

  • prism diopter — noun : an arbitrary standard of prismatic deflection equal to that of a prism that deflects a beam of light one centimeter on a plane placed at a distance of one meter * * * Optics. a unit of prismatic deviation, in which the number one… …   Useful english dictionary

  • prism diopter — 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. * * * …   Universalium

  • diopter — (dpt or D)    a metric unit used in optics to measure the refractive power of a lens. Each converging lens has a focal length, defined to be the distance from the center of the lens to the point at which the lens focuses light. (Diverging lenses …   Dictionary of units of measurement

  • diopter — The unit of refracting power of lenses, denoting the reciprocal of the focal length expressed in meters. [G. dioptra, a leveling instrument] prism d. (p.d.) the unit of measurement of the deviation of light in passing through a prism, be …   Medical dictionary

  • PD — Abbreviation for phenyldichloroarsine. * * * Doctor of Pharmacy; Dublin Pharmacopoeia; interpupillary distance; Paget disease; pancreas divisum; pancreatic duct; panic disorder; papilla diameter; paralyzing dose; Parkinson disease; parkinsonian… …   Medical dictionary

  • Pd — Symbol for palladium. * * * Doctor of Pharmacy; Dublin Pharmacopoeia; interpupillary distance; Paget disease; pancreas divisum; pancreatic duct; panic disorder; papilla diameter; paralyzing dose; Parkinson disease; parkinsonian dementia;… …   Medical dictionary

  • rule — A criterion, standard, or guide governing a procedure, arrangement, action, etc. SEE ALSO: law, principle, theorem. [O. Fr. reule, fr. L. regula, a guide, pattern] Abegg r. the tendency of the sum of the …   Medical dictionary

  • p.d. — Abbreviation of prism diopter …   Medical dictionary

  • PD — • Doctor of Pharmacy; • Dublin Pharmacopoeia; • interpupillary distance; • Paget disease; • pancreas divisum; • pancreatic duct; • panic disorder; • papilla diameter; • paralyzing dose; • Parkinson disease; • parkinsonian dementia; • paroxysmal… …   Dictionary of medical acronyms & abbreviations

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