Bifocals Definition

bīfōkəlz
noun
Eyeglasses with bifocal lenses.
Webster's New World

Spectacles that have corrective lenses of two different powers; used by people who need both distance and reading glasses.

Wiktionary

Origin of Bifocals

  • From bi- + focal (see focus), coined in 1824 by John Isaac Hawkins, inventor of trifocals. When the concept of bifocals was originally conceived by Benjamin Franklin, he called them double spectacles.

    From Wiktionary

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