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Bifocal
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0:43
YouTube
Genesis Science Initiative💡
Why Benjamin Franklin Invented Bifocals‼️⁉️ #bifocal #benjaminfranklin #inventionstories
In 1785, Benjamin Franklin described his invention of Bifocals in a letter to his friend George Whatley. Franklin had difficulty switching between separate glasses for reading and distance vision. Instead of accepting the inconvenience, he combined both lens types into one frame. The result was bifocal lenses. How bifocals work: The upper ...
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