bifocals
Definition from Wiktionary, a free dictionary
Contents |
[edit] English
[edit] 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.
[edit] Noun
bifocals (plural only)
- spectacles that have corrective lenses of two different powers; used by people who need both distance and reading glasses
