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Maybe your nephew mistook your Smith Factor Max Sunglasses for a viable teething toy and now your lenses are scratched (not to mention sticky and drooly). Or perhaps your lenses are fine, but you want to pick up some extra lenses with different tints so you can see on sunny days and in white-sky-bright conditions. Grab Smith's Factor Max Sunglass Replacement Lenses. Check out the sizing chart for lens tint information.