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en.wikipedia.org/wiki/Bifocals

Bifocals are eyeglasses with two distinct optical powers. Bifocals are commonly prescribed to ... Benjamin Franklin is generally credited with the invention of bifocals. ... of The Gazette of the United States, suggested that Franklin had indeed invented bifocals, and perhaps 50 years earlier than had been originally thought.

prezi.com/th85alooc7ym/bifocals-were-invented-in-1784-when-ben-franklin-had-troubl

Aug 30, 2013 ... Facts Bifocals were invented in 1784, when Ben Franklin had trouble seeing both close up and far away. Franklin had two pairs of spectacles ...

www.ushistory.org/franklin/science

Benjamin Franklin's inventions, innovations and discoveries including the kite experiment, Franklin stove, bifocals, armonica and more.

www.reference.com/history/did-benjamin-franklin-invent-bifocals-ea0f3ebea1bf582a

Benjamin Franklin invented bifocals in 1784. As announced in a letter to a friend, he called the new invention "double spectacles." The glasses allowed a person ...

www.antiquespectacles.com/topics/franklin/franklin.htm

In 1990 the year of the bicentennial celebration of Benjamin Franklin's death ..... “ It seems most likely that Benjamin Franklin did invent bifocals, most likely when ...

www.college-optometrists.org/the-college/museum/online-exhibitions/virtual-art-gallery/the-politician.html

US statesman Benjamin Franklin has long been credited with the invention of ... Presumably he did not curtail this activity while lodging at what is now ... that he may well have had the interest to experiment with bifocals at an earlier date. ... at the Royal Academy, Sir Joshua Reynolds, to have 'invented' bifocals in the 1760s .

factmyth.com/factoids/benjamin-franklin-invented-bifocals

Oct 29, 2015 ... Did Benjamin Franklin Invent the Bifocal? ... in 1785; a letter written by a friend in 1789 claims that he had used them for the past 50 years.

www.medgadget.com/2005/07/ben_franklin_an.html

Jul 22, 2005 ... Glass lenses, for use as magnifiers or for starting fires, date to about 300 BC, ... to aid or correct vision were almost certainly invented in 1280 in Florence, ... Bifocal spectacles were described in Franklin's in a further letter to ...

www.pbs.org/benfranklin/l3_inquiring_little.html

Some of his inventions, like bifocal glasses, are well-known, while others are more ... Of the numerous inventions Franklin created, he did not patent a single one. ... Three-wheel clock: Franklin invented a 24-hour, three-wheel clock that was ...

benjaminfranklinbio.com/bifocals-benjamin-franklin/122

Nov 6, 2013 ... On bifocals, Benjamin Franklin assured his vision-impaired friends that they would enjoy and possibly extend the later years of their life with ...