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What is "bifocal"

Crossword clues for bifocal

bifocal
The Collaborative International Dictionary
Bifocal

Bifocal \Bi"fo`cal\, a. [Pref. bi-+ focal.] Having two foci, as some spectacle lenses.

Bifocal

Bifocal \Bi"fo`cal\, n. [Pref. bi-+ focal.] a bifocal lens.

Douglas Harper's Etymology Dictionary
bifocal

"having two foci," 1844, from bi- + focal.

Wiktionary
bifocal

a. 1 (context optics English) Having two focal lengths 2 (context of a correcting lens English) Divided into two parts, one of which corrects for distance vision and the other for near vision

WordNet
bifocal

adj. having two foci; "bifocal eyeglasses"

Wikipedia
Bifocal

Bifocal may refer to:

  • Bifocals, eyeglasses whose corrective lenses each contain regions with two distinct optical powers
  • Fundamental matrix (computer vision), sometimes referred to as "bifocal tensor"

Usage examples of "bifocal".

A frowning middle-aged woman with conspicuously rouged cheeks, chunky bifocal glasses.

Her thinning blue-gray hair was set neatly above a smooth, plump face, broken only by the bifocal spectacles perched low on the bridge of her potato nose.