Huge advocate for
Rudy Project Sunglasses, and I work in the Optical biz so I trust their durability and warranty. You can choose from many different lens options depending on your riding conditions.....among my favorite is the ImpactX photochromic clear laser lens & the 3FX Polar grey. I personally wear the Noyz, but they have many options for prescription lenses & frames.
http://www.rudyprojectusa.com/sungla...php?group_id=1
I also highly recommend spending some time with your optician. They will go over the lens options with you and show you how each lens preforms etc.
For those of you that are spinning your wheels in Minneapolis,
Moss Optical is a great local shop that carries them!! They are independent, knowledgeable, and very friendly!
http://www.mossoptical.com/