I found the link to the presentations about 18th century spectacles that I was telling you about at the Spring Scout. There wasn’t as much in here regarding tinted lenses as I was thinking, but it’s a very good presentation regardless. Check it out…
http://www.scribd.com/doc/83737429/Spectacles-Copy
There is some more good info that I found on www.frontierfolk.net as well, including a bit about tinted lenses. Just hop on there and do some searches for spectacles, or sunglasses, or such. Hope this helps!
-Curtis
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