I find a pair of Transition Motorcycle Glasses priced $39.95 at http://www.valueteckenterprises.com/ They display the following features: UV400 Filter for Maximum UV Protection Scratch Resistant Coating Fits Over Most prescription glasses Soft Airy Foam Matte Black Nylon Frame Anti-Fog Lenses Comes Boxed with Micro-Fiber Pouch and Strap UV Activated Photochromic Transitional Lenses for Day or Night Use
Motorcycle transition glasses are suitable for driving in very sunny conditions because they can change dark when they are in the sun so that they can protect your eyes from strong light. The transition glasses for motorcycle usually range from $20-$60 depending on different types you choose. You can try ebay, amazon which have a wide selection of motorcycle transition glasses with affordable prices. But I am not sure whether they are in good quality. You should go to search them by yourself to get the detailed information.