Like many of the other reviewers here, I bought these lenses to replace the OEM lenses in my Flak 2.0 sunglasses. I'm not an expert on comparing quality between OEM and aftermarket. I will say that these lenses are very clear and perform well at a lower price point, especially for a full set of four lenses. My only complaint is alien to me. After using blue lenses for about a year, I wore lightweight rain goggles on my head by my eyes. After the rain, I lowered my glasses to naturally find raindrops on them. So I wiped off my raincoat and there was a stain on one of the lenses. Not all water droplets left only one dot in the center of the lens. Not sure what water has to do with it and it wasn't the first time my glasses (lenses) got wet. It just happened once.
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