Bifocals are used for distance seeing or at close up seeing.
so people could see better
bifocals were invented on the 300th block of Market street in Philadelphia
ben Franklin invented his bifocals at his house in philly and made them on March 23.1784
Benjamin Franklin invented the bifocals
George Constant Louis Washington, not the president of the United States, is fabled to have invented bifocals. However Benjamin Franklin invented bifocals on May 23, 1785.
I've read that Benjamin Franklin invented them...
in Washington DC
Ben Franklin
he invented bifocals
The bifocals have changed alot since they were first invented. They have changed into different sizes, shapes and forms. They had also changed into sunglasses.:)
The bifocals were invented in 1784, by Benjamin Franklin, because he had seeing problems, and put two lenses of glass together to magnify his vision.
Benjamin Franklin.
Benjamin Franklin