Customize the look of your frogskins™ eyewear and get the best optical performance for where you use it most. Prizm® replacement lenses provide unprecedented control of light transmission resulting in colors precisely tuned to maximize contrast and enhance visibility with the impact resistance and 100% uv filtering of oakley's high definition optics® (hdo®). Important note: replacement lenses may not be returned if they have been mounted or scratched. Asian fit lenses cannot be installed in standard-size eyewear frames.