Question

 When were bifocal glasses invented?

Answer The invention of bifocal glasses is credited to Benjamin Franklin in 1760. However, some historians believe they may have been invented by Benjamin West or Sir Joshua Reynolds in the same year. Bif... Read More »
http://www.answerbag.com/q_view/2048923

Top Q&A For: When were bifocal glasses invented

What Are Bifocal & Trifocal Glasses?

Bifocal and trifocal glasses are spectacles that help with presbyopia, a reading vision correction that occurs is people around the age of 40. Bifocal and trifocal lenses allow you to see both in t... Read More »
http://www.ehow.com/facts_6371128_bifocal-trifocal-glasses_.html

Who invented 3D glasses?

Sir Charles Wheatstone's research in 1838 led to the idea of stereoscopic vision, which is generally know as 3D, or three dimensional, imaging. Wheatstone realized that when two images are placed ... Read More »
http://www.answerbag.com/q_view/2347657

What year were 3D glasses invented?

The original 3D glasses were invented by Wilhelm Rollmann in 1853. The glasses are made with one red lens and one cyan lens. When wearing the 3D glasses and looking at a screen with 3D technology, ... Read More »
http://www.answerbag.com/q_view/1913305

What did people do before glasses were invented?

It seems glasses started to be used about 1450 (at least you start seeing people with glasses appearing in engravings, wood-cuts, paintings, etc starting about that time. Before this, for most peop... Read More »
http://answers.yahoo.com/question/index?qid=20101128193404AAbiq33


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