There is almost no visible difference between these lenses and Oakley lenses, both aesthetically and visually when worn. They don't have the POLARIZED engraving on the lenses like Oakley, but that doesn't matter. Considering the price, you can't go wrong with these. They were a bit difficult to understand at first, but that's probably because I didn't really understand what I was doing. The only reason they get 4/5 is because they are not as thick as Oakley lenses. They probably don't have a security rating either. I would not recommend them if you are ever in a situation where safety lenses are needed. It is sufficient for normal everyday use.
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