I just received this from Rudy Project. As a wearer of prescription glasses -- though when I am riding I use contacts -- I found this to be pretty cool.
RUDY PROJECT ANNOUNCES AVAILABILITY OF RX DIRECT INTERCHANGEABLE LENSES ON SEMI-RIMLESS TECHNICAL PERFORMANCE MODELS
San Clemente, CA January 2006 - Rudy Project Technically Cool Eyewear announced the expansion of its Authentic Sun Prescription Program to include RX Direct Interchangeable prescription lenses on its best selling semi-rimless performance models. RX lenses are initially available in its best-selling Ketyum, Rydon and Rydon II models, but the program will be expanded to other models in the near future. Power ranges are consistent with Rudy Project’s existing Sola Sunlens program. There is a slight up charge for the RX Direct Interchangeable lenses. The Rudy Project Authentic Sun Prescription Program is offered in alliance with Sola Technologies.
Brad Shapiro, Rudy Project Principal, stated, “this new technology, coupled with Rudy Project’s unique RX inserts, RX Swap and RX Direct options, clearly establishes Rudy Project as the leader in offering RX Solutions for athletes.”
If you are in the market for new glasses, I'd take a good look at these. They won't be cheap, but prescription glasses never are.