For the ultimate flexibility in lenses, the Smith I/OX has a quick-change system with a photochromic option among its dozen or so other choices. That way you can ski with a Smith’s Photochromic Red Sensor lens that automatically switches between a medium to light shade, or swap the whole lens out for a clear one or the absolute darkest glass in Smith’s line. Useful features on the I/OX are its frameless design, which offers huge peripheral vision, a helmet-compatible strap, and an anti-fog inner lens coating. The version with the photochromic lens costs $235, with an additional lens included.
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