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bifocal vision

См. также в других словарях:

  • bifocal — bifocal, ale, aux [ bifɔkal, o ] adj. • v. 1930; de bi et focal ♦ Opt. Qui a deux foyers. Lunettes bifocales, dont le verre est divisé en deux parties, l une pour la vision à distance, l autre pour la vision rapprochée (cf. À double foyer). ●… …   Encyclopédie Universelle

  • bifocal — ► ADJECTIVE ▪ denoting a lens having two parts each with a different focal length, one for distant and one for near vision. ► NOUN (bifocals) ▪ a pair of glasses with bifocal lenses …   English terms dictionary

  • bifocal — adj. Ópt. Que tiene dos focos. Se dice principalmente de las lentes que tienen dos partes, para corregir la visión a corta y a larga distancia …   Diccionario de la lengua española

  • bifocal — Having two foci. * * * bi·fo·cal ( )bī fō kəl adj 1) having two focal lengths 2) having one part that corrects for near vision and one for distant vision <a bifocal eyeglass lens> bifocal n 1) a bifocal glass or lens 2) bifocals pl… …   Medical dictionary

  • bifocal — I. adjective Etymology: International Scientific Vocabulary Date: 1888 1. having two focal lengths 2. having one part that corrects for near vision and one for distant vision < a bifocal eyeglass lens > II. noun Date: 1899 1 …   New Collegiate Dictionary

  • bifocal lens — a lens with two principal focal lengths: the upper part of the lens gives a sharp image of distant objects and the lower part gives a sharp image of near objects, as when reading. Examples are bifocal spectacles, bifocal contact lenses, and… …   Medical dictionary

  • bifocal — adj. & n. adj. having two focuses, esp. of a lens with a part for distant vision and a part for near vision. n. (in pl.) bifocal spectacles …   Useful english dictionary

  • bifocal — ► adjetivo ÓPTICA Que tiene dos focos: ■ gafas bifocales. * * * bifocal adj. Con dos focos. ⊚ Ópt. Se aplica, en particular, a las lentes y, sobre todo, a los cristales correctores de las gafas que tienen una parte para ver bien de lejos y otra… …   Enciclopedia Universal

  • bifocal — /buy foh keuhl, buy foh /, adj. 1. Chiefly Optics. having two foci. 2. (of an eyeglass or contact lens) having two portions, one for near and one for far vision. n. 3. bifocals, bifocal eyeglasses or contact lenses. [1885 90, Amer.; BI 1 + FOCAL] …   Universalium

  • bifocal — adjective denoting a lens having two parts each with a different focal length, one for distant and one for near vision. noun (bifocals) a pair of glasses with bifocal lenses …   English new terms dictionary

  • bifocal — bi•fo•cal [[t]baɪˈfoʊ kəl, ˈbaɪˌfoʊ [/t]] adj. 1) opt having two foci 2) oph (of an eyeglass or contact lens) having two portions, one for near and one for far vision 3) bifocals, bifocal eyeglasses • Etymology: 1885–90, amer …   From formal English to slang


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