Sorry to resurrect an old thread, but I tried wearing some shades under my Icon lid for the first time today, I have Spy polarized glasses (don't remember the model, Vega maybe?). They fit well enough under the lid, however I panicked when I tried to read my speedometer and all I saw was a black blob. Turns out it was just when viewing through the glasses. I also saw very purdy rainbows when looking through my clear visor, and the windscreen as well. I had to take off the glasses, it was making me sick. A quick google search seemed to show this was normal with polarized glasses, just wondering if anyone else had experienced it.