I have purchased many interchangeable lenses over the years (Revant, Visionary, Seek and Genuine Oakley) and they all do the job adequately. A common problem I've had with all non-Oakley lenses is moderate distortion at the very edges of the lenses. I thought Oakleys were the only lenses that didn't have edge distortion. until I bought this. WITHOUT DISTORTION AT THE EDGES! Wonderful. Also, most lenses only claim ANSI Z80.1, which is the lens standard, but these lenses claim ANSI Z87.1. Only time will tell if this is indeed Z87.1, although I hope I never have to find out.
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