Rudy Project Kerosene replacement lenses are afocal sunglass lenses which are optically correct and provide excellent clarity. Our lenses absorb all of the ultraviolet rays. The lens receives an application of metal ions of chrome or silicon oxide to provide a precise UV absorption factor. Respecting the need of optical quality and visual clarity, the optical axis is maintained parallel to the main axis of vision, permitting maximum utilization of lenses with extensive curvature. Treated by coating with polyxilosane, the lens is hardened by exposure to heat at 120¬∞C. This specific treatment gives it excellent resistance to abrasion and scratching. Replacement lenses available in clear or yellow.