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23/05/1785 Benjamin Franklin invents bifocals


The Founding of America: Benjamin Franklin


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Great Minds: Benjamin Franklin: Founding Nerd

One of the founding fathers of the USA, Benjamin Franklin, described bifocals in a letter to his friend. For Franklin, the bifocals were a way how to avoid wearing two pairs of glasses. Franklin wrote, “I had the glasses cut and half of each kind associated in the same circle. I have only to move my eyes up and down.”
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