May 23

On May 23, 1785, Benjamin Franklin revealed the creation of the bifocal eyeglass, which would forever allow libraries and the elderly to see both close-up and far away. Franklin came up with the notion since he was "growing old" and had difficulty seeing both up close and far away. He was bored of switching between two pairs of glasses, so he discovered a technique to accommodate both types of lenses into the same frame. He positioned the distant lenses on top of the frame and the close-up lenses on the bottom.
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