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.
bifocal glasses
No, but he is credited with inventing the first pair of bifocals - prior to that, people needed two sets of spectacles, one for distance, one for reading. Franklin combined them into one.
benjamin franklin invented spectacles,(glasses),and discovered electricity.
It's not easy to tell you when Franklin invented glasses, because they were well documented in Europe prior to 1300, i.e. 500 years before Franklin was born. Ben Franklin did invent a number of other things, including bi-focals.
In his house in Philly because he got tiered of taking off and putting back on his glasses when he wanted to read. So he got 2 lenses and set his mind to work!
1784
He invented bifocal glasses.
Lightning rod, Franklin stove, and bifocal glasses.
bifocal glasses
what year did Benjamine invent electricity 1706
YES
No, but he is credited with inventing the first pair of bifocals - prior to that, people needed two sets of spectacles, one for distance, one for reading. Franklin combined them into one.
Benjamin Franklin invented the arrangement of the glasses in 1761.
no way. Benjamin Franklin did.
Benjamin Franklin is credited with inventing the bifocal lens in the 1780s. He designed the lens to help address his presbyopia, a condition that makes it difficult to focus on close objects as people age.
benjamin franklin invented spectacles,(glasses),and discovered electricity.
no