Why did benjamin franklin invent bifocal glasses?

Answer 1

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.

Answer 2

The problem was that he had to change from one pair of glasses to the other when he wanted to see near or far. To solve the problem, he invented what we now call bifocals--glasses that would help him do both.

Reason

When signing or reading important papers, Franklin was constantly changing his glasses to see the document.

First Attempts

Franklin attempted to combine two pairs of glasses on his face at once; however, these attempts were futile.

Design

Franklin sketched out a preliminary design of a set of glasses that would allow him to see both distances with one pair of glasses. He sent the sketch to George Whatley in 1785 for an opinion.

Preconstruction

Dr. Peter Dollond, a London optician, agreed to make Franklin's glasses; however, he was skeptical they would work.

Construction

The doctor cut n half the lenses of both of Franklin's glasses--near and far--and placed them in one frame, with the near lens on the bottom and the far on the top. The invention worked for Franklin and he was pleased thereafter.

Answer 3

Bifocal glasses can be used for reading and looking a items far away. There lens on the bottom is used for reading and the lens on top is used to look at things far away. If there was only one lens, it would be useful for reading Or looking at things far away. Bifocals are used to see items near And far away from the person looking at the item.

Answer 4

He took two different pairs of glasses with different strengths and cut each lenses in half. Then he pasted the the bottom of the stronger pair to the top of the less strong pair. And voila! You have bifocals!

Answer 5

he got tired of switching glasses of rea

ding and seeing far

Answer 6

two pairs of spectacular cut in half of each lens in a single frame today we call them bifocals they were invented in 1784

Answer 7

because when he wore glasses morning and night he didn't want glasses to see in the morning so then he cut his bifocal glasses in two peaces and made the first glasses in the world

Answer 8

yes
yes

Answer 9

he couldn't see