I agree 100% with Troy and Tommys, I also looked and bought more sunglasses than anyone should, for me the NYX from Peidmont is the best, like everyone has said interchangable lens for verying conditions, light weight and comfortable to wear, the only thing close was a pair I had made in the 80's that had fade away lens so I could tilt head to make lighter or darker, I have had the Peidmont NYX for 3 years and love them, you can do a search and find many options for lens for these but what comes with them is just perfect.
Steve Maxwell