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Benjamin Franklin did.

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Inventor of bifocal glasses?

Benjamin Franklin


Did Samuel pirece invent the bifocal?

Franklin did.


Did thomas Jefferson invent the bifocal glasses?

no


Where is the optical center of a bifocal lens?

The optical center of a bifocal lens is typically located at the point where the two different lens powers (for distance and near vision) meet. This point is usually slightly below the center of the lens. It is important for the correct fitting and alignment of bifocal lenses for optimal vision correction.


Can you change the bifocal prescription on glasses without changing the lens?

No, you cannot change the bifocal prescription on glasses without changing the lens. The lens is what is prescribed by your eye doctor. The frame, however, can be changed.


When did benjamin franklin invent bifocal glasses?

1784


What is a bifocal lens?

bifocals are glass lens that you place upon your nose & push up. they help you see better & / read


What did Benjamin Franklin invent to improve his eyesight?

He invented bifocal glasses.


What is the defernition for bifocal?

Bifocal is a type of corrective lens. Bifocal lenses are divided into two sections, usually the top for seeing far away objects and the bottom for seeing nearby objects.


What would you use to study organisms in a drop of water?

a bifocal lens


How did bifocal got its name?

Two focal lengths in one lens.


What does add hi low med mean in contact lenses?

It means you are using a bifocal contact lens that has a bifocal power of about +1.25 to +1.50. A high add would have the bifocal power of about +2.50.