Super light sunglasses. They weigh in a only 1.1 oz.
I use them for mountain biking more than I do backpacking, and they are really versatile as you can swap the lenses out. When hiking they are in 'shades' mode, when riding they are in 'orange' mode for better visibility in the forest.
What's not to like about a pair of shades that has 20 different lense color choices, including "Multi Laser
Blue"?
Available from Amazon for $115.
i’m going to try uvex genesis safety glasses. screens uv, various lens choices and they cost only about $10 [i lose things], wt 32.9 grams = 1.16 oz
found this place to buy them
http://www.safetyglassesusa.com/searchresult.html?catalog=safetyglassesusa&query=genesis&searchsubmit.x=0&searchsubmit.y=0&searchsubmit=Go
specs/info on the lens choices at the bottom of this page
http://www.westernsafety.com/uvexeyewear/uvexpg1.html