Someone posted an article a while back from an eye doctor that said photochromic (sp) lens were the best for eye protection. The only companies that had those lens that I could find were Oliver Peoples / Paul Stuart and Oakley.
I've bought several pairs of Lunor sunglasses from Robert Marc in NYC and have been extremely pleased. The frames are very ightweight and the lenses are german optical glass. One pair that I own has telescoping temples which is a nice feature to ensure a perfect fit.