Benjamin Franklin | The Invention of Bifocal Lenses | The History of Optometry - YouTube
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Invention of the Bi-focal | #TBT to the first pair of bifocals! Invented by Benjamin Franklin in 1784. Franklin wrote, to his friend George Whatley, that he was "happy in the...
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How and Why Benjamin Franklin Invented Bifocals
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Image of BIFOCALS, 1760s Benjamin Franklin's sketch for bifocal eyeglasses, which he
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Hard a port(al)
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Silver spectacles with round bifocal lenses and sliding side arms... Fotografía de noticias - Getty Images
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History of Eyeglasses | Who Invented Glasses? – ReadingGlasses.com
Medieval sunglasses? – Melnick Medical Museum
Ben Franklin's inventions: bifocals
What Are Bifocals? How Do They Work? | Warby Parker
Ben Franklin: Inventor and Innovator | University of Pennsylvania Almanac
Bifocal Lenses - Eye Doctor in Crestwood, Mokena, and Manhattan IL
