Bifocal and trifocal lenses solved problem for people who have multiple vision troubles. They could have one pair of glasses for reading and distance. They did not have to carry around several sets of glasses. They even have bifocal and trifocal sunglasses now.
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.
no she did not solve any of his problems
To solve problems quickly you must have simple but effective method.
Please help me find my bifocals.
because bifocals are still used today and without bifocals you would have to have 2 pairs of glasses that's why its Important
bifocals changed in size, shape, and magnification.
Bifocals.
* lightning rod * Franklin stove * odometer * bifocals* lightning rod * Franklin stove * odometer * bifocals* lightning rod * Franklin stove * odometer * bifocals* lightning rod * Franklin stove * odometer * bifocals* lightning rod * Franklin stove * odometer * bifocals* lightning rod * Franklin stove * odometer * bifocals
Bifocal lenses as a concept were not patented; there are dozens of patents related to bifocals, bifocal contacts, and processes to make bifocals.
How Information systems help KIA to solve its problems?
Peter and his followers solve the problems to the community by providing them with food.
Can't help solve problems.