Oakley A Frame Prizm 2.0 Replacement Lens - Black Iridium: Oakley lens tints are engineered to offer the best combination of light filtering, color balance and visual contrast. Visibility on the mountain can vary wildly, from socked-in blizzards to blindingly bright sunlight, and everything in between. Oakley offers a comprehensive array of performance lenses that match specially engineered base tints with unique IridiumA(R) coatings, designed to precisely tune, contrast and balance light transmission. PRIZM(TM) SNOW Prizm(TM) is a revolution in lens optics built on decades of color science research. Prizm(TM) lenses provide unprecedented control of light transmission resulting in colors precisely tuned to maximize contrast and enhance visibility. HIGH DEFINITION OPTICSA(R) High Definition OpticsA(R) (HDOA(R)) 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.