bifocals

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English[edit]

Etymology[edit]

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.

Noun[edit]

bifocals (plural only)

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

Related terms[edit]

Translations[edit]