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Bifocals

en.wikipedia.org/wiki/Bifocals

Bifocals are eyeglasses with two distinct optical powers. Bifocals are commonly prescribed to ... Benjamin Franklin is generally credited with the invention of bifocals. Historians have produced som...

Benjamin Franklin's contributions to science - USHistory.org

www.ushistory.org/franklin/science/

Benjamin Franklin's inventions, innovations and discoveries including the kite experiment, Franklin stove, bifocals, armonica and more.

Ben Franklin Glasses - Ben Franklin Spectacles | Benjamin Franklin

benjaminfranklinbio.com/bifocals-benjamin-franklin/122/

Nov 6, 2013 ... bifocals benjamin franklin As Benjamin Franklin aged, his vision, which had never been great, deteriorated even further. Like many of the ...

Benjamin Franklin . Inquiring Mind . It's the Little Things | PBS

www.pbs.org/benfranklin/l3_inquiring_little.html

Some of his inventions, like bifocal glasses, are well-known, while others are more obscure. Of the numerous inventions Franklin created, he did not patent a ...

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

www.allaboutvision.com/over40/segmented.htm

Dr. Gary Heiting describes which type of bifocal and trifocal eyeglass lenses best fit your vision ... Bifocal inventor Benjamin Franklin reading a manuscript. Later ...

The 'inventor' of bifocals? - The College of Optometrists

www.college-optometrists.org/en/college/museyeum/online_exhibitions/artgallery/bifocals.cfm

US statesman Benjamin Franklin has long been credited with the invention of bifocal spectacle lenses, but whether this is historically accurate or merely a myth  ...

Ben Franklin and the Bifocal | Medgadget

www.medgadget.com/2005/07/ben_franklin_an.html

Jul 22, 2005 ... When you think of medgadgets, maybe eyeglasses don't spring to mind -- probably because they've been around so long, and are so prevalent ...

When did Benjamin Franklin invent bifocals? | Reference.com

www.reference.com/history/did-benjamin-franklin-invent-bifocals-ea0f3ebea1bf582a

Benjamin Franklin invented bifocals in 1784. As announced in a letter to a friend, he called the new invention "double spectacles." The glasses allowed a person ...

Top 10 Ben Franklin Inventions | HowStuffWorks

science.howstuffworks.com/innovation/famous-inventors/10-ben-franklin-inventions.htm

Most people in colonial Pennsylvania were content to do their reading in a simple wooden chair. Ben Franklin, on the other hand, insisted on kicking back in a ...

Benjamin Franklin and Bifocal Glasses - Benjamin Franklin House

www.benjaminfranklinhouse.org/site/sections/about_franklin/Issue 6 Bifocal glasses.pdf

I was recently invited as a trustee of Benjamin Franklin House to the council dinner of ... many books on Ben Franklin state he invented bifocal spectacles.

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Benjamin Franklin-Father of the Bifocal

www.antiquespectacles.com

Adapted from the important key article by Dr. Charles Letocha, also the wonderful book by Dr. John Levene and finally the comprehensive paper (yet ...

About Benjamin Franklin: Inventor of the Bifocal Glasses

www.readers.com

To learn more about the remarkable life of Benjamin Franklin, we have collected a variety of resources about his life and accomplishments!

Inventions and Achievements of Benjamin Franklin - Inventors

inventors.about.com

Benjamin Franklin invented the lightning rod - iron furnace stove - bifocal glasses and odometer - sp Ben Franklin.