Customize the look of your GASCAN™ eyewear and get the best optical performance for where you use it most. All replacement lenses feature the unbeatable clarity, 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.