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Because he needed them himself. Both his distant vision and his near vision were becoming weaker.

He invented bifocals because he was tired of swapping from his reading glasses to his "looking out the window" glasses. He wanted something that combined both of them. To create bifocals, he put half of the lens from his "looking out the window" glasses in the top half of the eyeglass frame, and then half of the lens from his reading glasses into the bottom half of the frames. The combined form became popular and helpful to many people. Of course, he later used shortened versions of these lenses that worked even better.

People who are both far-sighted and near-sighted only need one pair of glasses.

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9y ago

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