diopter lens

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• diopter — or dioptre [dī äp′tər] n. [Fr dioptre < L dioptra < Gr instrument for leveling, etc. < dia , through + base of opsis, sight < ops, EYE] a unit of measure of the power of a lens, equal to the power of a lens with a focal length of one… …   English World dictionary

• Lens clock — A lens clock is a mechanical dial caliper that is used to measure dioptric power of a lens. It is a specialized version of a spherometer. A lens clock measures the curvature of a surface, but gives the result in diopters, assuming the lens is… …   Wikipedia

• 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 — dioptral, adj. /duy op teuhr/, n. 1. Optics. a unit of measure of the refractive power of a lens, having the dimension of the reciprocal of length and a unit equal to the reciprocal of one meter. Abbr.: D 2. an instrument, invented by Hipparchus …   Universalium

• Diopter (disambiguation) — In modern usage, diopter or dioptre is a measure of the refractive power of an optical system. Diopter may also refer to: Any lens system, such as a telescope A diopter sight A close up lens used in photography A theodolite or similar surveyor s… …   Wikipedia

• Lens mount — A lens mount is an interface mechanical and often also electrical between a photographic camera body and a lens. It is confined to cameras where the body allows interchangeable lenses, most usually the single lens reflex type or any movie camera… …   Wikipedia

• diopter — noun A unit of measure of the power of a lens or mirror, equal to the reciprocal of its focal length in meters. Myopia is diagnosed and measured in diopters …   Wiktionary

• 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

• diopter — di·op·ter || daɪ É’ptÉ™ n. unit of measure of the refractive power of a lens (Optics) …   English contemporary dictionary

• diopter — di•op•ter [[t]daɪˈɒp tər[/t]] n. opt a unit of measure of the refractive power of a lens, having the dimension of the reciprocal of length and a unit equal to the reciprocal of one meter Abbr.: D Also, esp. brit. di•op′tre. Etymology: 1585–95;… …   From formal English to slang

• diopter —   n. unit of power of lens, the reciprocal of the focal length in metres.    ♦ dioptric, a. pertaining to refraction of light; transparent.    ♦ dioptroscopy, n. measurement of refractive power of eye.    ♦ dioptrics, n. study of refraction of… …   Dictionary of difficult words