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Image of BIFOCALS, 1760s Benjamin Franklin's sketch for bifocal eyeglasses, which he
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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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Silver spectacles with round bifocal lenses and sliding side arms... Fotografía de noticias - Getty Images