Smith I/OX, I/O, I/O7, and I/OS replacement lenses now available here at Norse. The Smith I/O series is the most popular high end goggle on the market. All of the Smith I/OX, I/OS, I/O7, and I/O goggles come with two lenses, and if you've recently lost a lens, gotten it scratched, or if you're looking to increase your collection of lenses, this is the place to buy! Smith carries a huge selection of tints for different light conditions, so you can get that perfect lens color when the sun conditions change.