bifocals

English

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.

Noun

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

Related terms

• bifocal
• trifocals

Translations

spectacles with two different powers

• Finnish: kaksiteholasit
• German: Bifokalbrille f, Zweistärkenbrille f
• (deprecated template usage) {{trans-mid}}
• Navajo: nákʼee sinilí naakijįʼ bee hootʼínígíí