Prizm a frame 20 snow replacement lensmaximized performance in any light conditionoakley 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 iridium coatings designed to precisely tune contrast and b