How were glasses invented? How were sight deficiencies first detected?

Subject: How were glasses invented? How were sight deficiencies first detected?

Date: Fri Jul 21 03:39:34 2000
Posted by Gretel Hickman
Grade level: teacher/prof School: McKendree College
City: Lebanon State/Province: IL Country: U.S.
Area of science: Science History
ID: 964165174.Sh

Message:


I am interested in the history of glasses.  Were many people able 
to "discover" how to correct vision simultaneously, or is there one clear 
inventor of glasses?  Before the invention of sight correction, were 
people who did not see well "de-selected" by the evolutionary process?

Re: How were glasses invented? How were sight deficiencies first detected?

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