Years ago my wealthy college girlfriend and I were tooling around in her Lexus one particularly sunny spring day. I was cleaning my sunglasses for the second time and she leaned over and handed me hers, saying "try these." Wow. "Serengeti drivers," she said. "Once you get used to these, you can never go back."Well, she's just a distant, happy memory, but I've been wearing Serengetis ever since.Pisa"See" for yourself....