bifocals "bifocal spectacles," 1899, see BIFOCAL (Cf. bifocal). Conceived by Benjamin Franklin, but called by him double spectacles.

Etymology dictionary. 2014.

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  • Bifocals — are eyeglasses whose corrective lenses each contain regions with two distinct optical powers. Bifocals are most commonly prescribed to people with presbyopia who also require a correction for myopia, hypermetropia, and/or astigmatism.… …   Wikipedia

  • Bifocals — Bi fo cals, n. pl. [Pref. bi + focal.] eyeglasses whose lenses have two foci, allowing the wearer to see both far and nearby objects clearly. The lenses are partitioned horizontally, the upper and lower parts having different focal lengths. [PJC] …   The Collaborative International Dictionary of English

  • bifocals — ☆ bifocals [bī′fō΄kəlz ] pl.n. eyeglasses with bifocal lenses * * * …   Universalium

  • bifocals — ☆ bifocals [bī′fō΄kəlz ] pl.n. eyeglasses with bifocal lenses …   English World dictionary

  • bifocals — [[t]ba͟ɪfo͟ʊk(ə)lz[/t]] N PLURAL (The form bifocal is used as a modifier.) Bifocals are glasses with lenses made in two halves. The top part is for looking at things some distance away, and the bottom part is for reading and looking at things… …   English dictionary

  • bifocals — noun spectacles that have corrective lenses of two different powers; used by people who need both distance and reading glasses See Also: bifocal, trifocals …   Wiktionary

  • bifocals — bi·fo·cals (biґfo kəlz) bifocal glasses …   Medical dictionary

  • bifocals — Synonyms and related words: Polaroid glasses, blinkers, cheaters, colored glasses, contact lens, dark glasses, divided spectacles, eyeglass, eyeglasses, glasses, goggles, granny glasses, harlequin glasses, horn rimmed glasses, lorgnette, lorgnon …   Moby Thesaurus

  • bifocals — bi|fo|cals [baıˈfəukəlz US ˈbaıfou ] n [plural] special glasses with an upper part made for seeing things that are far away, and a lower part made for reading >bifocal adj …   Dictionary of contemporary English

  • bifocals — bi|fo|cals [ baı fouklz ] noun plural a pair of GLASSES with special LENSES that let you see things that are near if you look through the bottom part, and see things that are far away if you look through the top part …   Usage of the words and phrases in modern English

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