Customize the O2 MX goggle with your choice of lens color and choose the best optics for your environment. These single lens options are made of optically pure Lexan® for durable impact resistance and 100% UV filtering. For select goggles, choose an optional Iridium® lens coating to minimize glare and tune light transmission. Replacement lens for the Oakley O2 MX Goggles. High Definition Optics® - High Definition Optics® (HDO®) is a collection of patented technologies that allow Oakley eyewear to meet or exceed the testing standards of the American National Standards Institute for optical clarity, visual fidelity, and impact resistance. UV Protection - Eye damage attributed to ultraviolet light includes cataracts, pterygium and macular degeneration. Lexan® lens material filters out 100% of all UV.