I wore polarized lenses while instructing and also as an FO. I don't believe the FAA's assertion that it will prevent you from "See & Avoid". I always see the other traffic just fine. Yes, some aircraft you can see weird purple colors on the windshield and some instruments sometimes look a shade different - I feel they enhance my vision by eliminating glare off of shiny objects. I have been in a lot of different aircraft and have yet to have a problem seeing out or seeing any of the instruments or seeing traffic. I could not fly with out them. I'm just that used to them and their benefits - even if they haven't been TSO'd by the FAA - I will continue to wear them.