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Bifocals

noun

Definitions

Noun
  1. 1
    Spectacles that have corrective lenses of two different powers; used by people who need both distance and reading glasses. plural, plural-only

    "He unfolded a pair of bifocals and thrust them as far up the bridge of his nose as possible."

  2. 2
    (plural) eyeglasses having two focal lengths, one for near vision and the other for far vision wordnet

Etymology

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.

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