I read this article last week, but I really liked it and it stuck with me. It's from a blog called, "Two Nerdy History Girls," who both write historical fiction and blog about all the interesting historical things they come across in their research. They often blog about historical fashion, which I love.
http://twonerdyhistorygirls.bl.....-1830.html
This post is called "Tinted Glass Spectacles, c. 1830." I really found the painted portraits of the men in smoked glasses fascinating, because it's something you don't see that often. I was also surprised that "sunglasses" (even in this early form) have been around so long, and have come a long way.