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The Difference Between Bifocals and Regular Glasses | eHow.com

He had a pair of glasses for reading or close up work and another pair for distance. Between 1760 and 1780 he invented and developed the bifocal lens, .
http://www.ehow.com/info_7851947_difference-between-bifocals-regular-glasses.html


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Benjamin Franklin - Bifocals

In 1784, Ben Franklin developed bifocal glasses. He was getting old and was having trouble seeing both up-close and at a distance. Getting tired of switching .
http://inventors.about.com/od/fstartinventors/ss/Franklin_invent_4.htm


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Optician - Wikipedia, the free encyclopedia

Benjamin Franklin in the 1780s developed the bifocal. Bifocal lenses advanced little in the first half of the 19th century. The terms bifocal and trifocal were .
http://en.wikipedia.org/wiki/Optician


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Multifocal Eyeglass Lenses | Northville Vision

Sometime around 1780, Franklin cut two lenses in half (one with a distance . There have been many changes to bifocal eyeglass lenses since Franklin's .
http://northvillevision.net/articles/vision-over-40/multifocal-eyeglass-lenses


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Benjamin Franklin's Inventions

A modern replica pair of the type of split bifocal spectacles known to have been worn by Benjamin Franklin in the mid 1780s. Bifocals are eyeglasses with an upper and lower half, the upper for distance, and the lower for reading. Bifocals are .
http://www.ushistory.org/franklin/info/inventions.htm


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BFH Letterhead - Benjamin Franklin House

many books on Ben Franklin state he invented bifocal spectacles. . Benjamin West started to use split lenses – for by the 1780s his eyesight was failing, .
http://www.benjaminfranklinhouse.org/site/sections/about_franklin/Issue%206%20Bifocal%20glasses.pdf


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[Regents Prep U.S. History] Science & Technology: Early United States

Important American Inventions. 1752, Benjamin Franklin, Lightning Rod. 1776, David Bushnell, Submarine. 1780, Benjamin Franklin, Bifocal lenses. 1786, John .
http://www.regentsprep.org/regents/ushisgov/themes/science/erl.cfm


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Bifocals and Trifocals for Vision After Age 40 - AllAboutVision.com

Dr. Heiting describes which type of bifocal and trifocal eyeglass lenses best fit your . Sometime around 1780, Franklin cut two lenses in half (one with a distance .
http://www.allaboutvision.com/over40/segmented.htm


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Vision Over 40 - Elite Optical

Some multifocal contact lenses have a bifocal design with two distinct lens powers . Sometime around 1780, Franklin cut two lenses in half (one with a distance .
http://www.eliteopticalaz.com/vision-over-40.html


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What were inventions in the 1700's

Samuel Crompton invents the spinning mule. 1780 * Benjamin Franklin invents bi -focal eyeglasses. * Gervinus invents the circular saw. 1783 * Louis Sebastien .
http://wiki.answers.com/Q/What_were_inventions_in_the_1700's


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Industrail Rev. timeline | Timetoast timelines

12/09/1780, Gervinus, circular saw. Images-19_tiny, 12/09/1780, Ben Franklin, Bi - focal glasses. Images-20_tiny, 12/09/1783, Montgolfier brothers, hot air .
http://www.timetoast.com/timelines/32487


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Benjamin Franklin-Father of the Bifocal

Benjamin Franklin-Father of the Bifocal . Franklin for his major role in the development of bifocal eyeglasses. . 6) Since both Benjamin West and his teacher Sir Joshua Reynolds could have had bifocal spectacles in the mid-1780s it is easy .
http://www.antiquespectacles.com/topics/franklin/franklin.htm


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How Do Eyeglasses Come into Being?

Mar 14, 2010 . But in the mid 1780's, eyeglasses of the bi-focal came into being with the efforts of inventor and visionary Benjamin Franklin. There is an .
http://blog.firmoo.com/how-do-eyeglasses-come-into-being.html


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Bifocal Glasses History - Invention of Bifocal Glasses

Glass lenses, for use as magnifiers or for starting fires, date to about 300 BC, but the first eyeglasses to aid or correct vision were almost certainly invented in .
http://www.ideafinder.com/history/inventions/bifocals.htm


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Eyeglasses History

Feb 12, 2010 . The credit for inventing reading glasses or bifocal lenses is given to Benjamin Franklin who developed it around 1780s. Bifocal lenses are .
http://www.buzzle.com/articles/eyeglasses-history.html


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When Were Eyeglasses Invented? - Answers.Ask.com

Early glasses were pinched down on the nose, it took several hundred years to realize that side pieces . Benjamin Franklin invented the bifocal in the 1780s.
http://answers.ask.com/Health/Other/when_were_eyeglasses_invented


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What Are Trifocal Lens? | eHow.com

In the 1780s, Franklin glued together two lenses (a long-distance and a short distance lens), which he had cut in half. New bifocal lens, also known as the .
http://www.ehow.com/info_8336933_trifocal-lens.html


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Timeline (1780-1790) - The Benjamin Franklin Tercentenary

May 23: Franklin described his invention of bifocal glasses. July 24: Franklin arrived at Southampton, England, and was visited by his son William, as well as by .
http://www.benfranklin300.org/etc_timeline_7.htm


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Eight Prescription Eyeglasses From $89

Check out the Eight 576B Gunmetal glasses online, and you'll know! . Women's Multifocal Glasses . For Bi-focal and Progressive lenses, please provide the .
http://www.glassesusa.com/glasses-online-1780.html


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History of Reading Glasses

Benjamin Franklin is often credited with inventing glasses, but in fact he was the one who developed the bifocal lens in the 1780's, because he got tired of .
https://www.4readers.com/t-definitions36.aspx


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Bifocal Glasses | Firmoo's Blog - Part 2

Oct 5, 2011 . Metal Frame Bifocal Eyewear: The Best Choice For Those With . But in the mid 1780's, eyeglasses of the bi-focal came into being with the .
http://blog.firmoo.com/tag/bifocal-glasses/page/2


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The History of Sunglasses – Sunglasses Are Older than You Think

Aug 10, 2012 . The invention which revolutionized the way in which glasses were used belongs to Benjamin Franklin. In 1780 he invented the bifocal lenses.
http://twistedladdermedia.com/the-history-of-sunglasses-sunglasses-are-older-than-you-think/


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