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Photochromic sunglasses, or glasses that change to sunglasses in sunlight, already use a similar process, Cronin said.

The physical design is all new, combining thin flat sides with a curved back panel that, at least on the “sunrise blue” model, uses a photochromic layer that changes color under exposure to sunlight.

I also wanted photochromic lenses that would darken in sunlight.

Before using your tablet or smartphone to link up with Y, put on a pair of photochromic ski goggles; amber works best.

Turtle Fur QuattroClava Face mask $45 at Turtle Fur Julbo Aerospace Goggles These goggles have photochromic lenses, which means they automatically get darker when ambient light increases, and then get lighter when the clouds come out.