What more can I say, I bought four pairs. By the way, they're tough. I was walking fast, as usual, and didn't see a lifted edge to the sidewalk, so I made a one point landing skinning hands, arms , knees, just like a little kid, of course the glasses went flying off my face when my chin slammed ...I SAW them slide four feet on the cement, the front ( convex) part of the lenses down, I thought, "Well, so much for my new sun glasses", NOT ONE SCRATCH. The light filtration is indeed at the right frequency, I can wear them well into dusk before they come off. Great glasses.