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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.
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.
ReasonWhen signing or reading important papers, Franklin was constantly changing his glasses to see the document.
First AttemptsFranklin attempted to combine two pairs of glasses on his face at once; however, these attempts were futile.
DesignFranklin 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.
PreconstructionDr. Peter Dollond, a London optician, agreed to make Franklin's glasses; however, he was skeptical they would work.
ConstructionThe 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.
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.
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!
two pairs of spectacular cut in half of each lens in a single frame today we call them bifocals they were invented in 1784
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
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What did Benjamin Franklin invent to help people see well?
bifocal glasses
Did Benjamin Franklin invent the ocular device?
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.
What did Benjamin Franklin invent other than a public library?
benjamin franklin invented spectacles,(glasses),and discovered electricity.
How did Benjamin Franklin invent glasses?
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.
Where did Benjamin Franklin invent the bifocal?
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!
When did benjamin franklin invent bifocal glasses?
1784
What did Benjamin Franklin invent to improve his eyesight?
He invented bifocal glasses.
What are the things Benjamin Franklin invent?
Lightning rod, Franklin stove, and bifocal glasses.
What did Benjamin Franklin invent to help people see well?
bifocal glasses
When did Benjamin Franklin invent electricity.and the stove that saved fuelor bifocal glasses and when did he die and were was he buried and what was his impotabs in the revolutinary war?
what year did Benjamine invent electricity 1706
Did Benjamin Franklin invent the ocular device?
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.
Did Benjamin Franklin invent glasses?
YES
When did Benjamin Franklin invent the armonica?
Benjamin Franklin invented the arrangement of the glasses in 1761.
Did the incas invent glasses?
no way. Benjamin Franklin did.
Who invent the bifocal lens?
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.
What did Benjamin Franklin invent other than a public library?
benjamin franklin invented spectacles,(glasses),and discovered electricity.
Did thomas Jefferson invent the bifocal glasses?
no
