Topic: Bifocal
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What are Bifocals?
Bifocals are those glasses that your grandmother probably wears to help her see better. They usually have two different strengths of prescriptions with one helping her see things up close and the other to see things from afar. Ben Franklin ... Read More »
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Who Invented Bifocals?
Benjamin Franklin invented bifocals in 1784 and nicknamed them "my double spectacles." John Issac Hawkins who invented the tri-focals, came up with the term bifocals and credited Ben Franklin with their invention. Read More »
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When Were Bifocals Invented?
In the 1700's eyeglasses were known as "spectacles". Bifocals are spectacles that were invented by Benjamin Franklin. Ben Franklin invented these spectacles so that he could read as well as perform other everyday tasks. Bifocals are one pai... Read More »
Source: http://answers.ask.com/Fashion_and_Beauty/Clothing/when_were_bifo...
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Bifocal
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The inventor of bifocal lenses was Benjamin Franklin. Bifocal lenses were invented in 1760. Bifocal lenses are the combination of concave and convex lenses, with the top lens for distant viewing, and the lower lens for reading.
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The first bifocals used to correct eyesight were invented in 1280 by Allessandro Della Spina and or his friend Salvino Degli Armiti. Armati was a physicist..
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Source: http://answers.ask.com/Fashion_and_Beauty/Clothing/who_invented_b...
Bifocals work by having two different concavities in the same lens - the lens on the bottom is shaped so the user can see close up and the upper portion is used to see distances.
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Source: http://answers.ask.com/Fashion_and_Beauty/Other/how_do_bifocals_w...
There are two different types of bifocal contact lenses. These are Gp that are for distance and soft bifocal for near. You can also get soft multifocal that is for both.
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Source: http://answers.ask.com/Fashion_and_Beauty/Other/how_do_bifocal_co...
bifocals are glasses that can help you see close and see far.bi means two.
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Source: http://wiki.answers.com/Q/Telephone+is+to+ear+as+bifocal+is+to
bifocals are glass lens that you place upon your nose & push up. they help you see better & / read
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Source: http://wiki.answers.com/Q/What+is+bifocal+vision
