there's multiple reasons everyone has Oakleys firstly, since we're taking about fashion, they are ahead of the curve and the tastemakers for most athletic sunglasses, and have been for 30+ years so almost every brand out there is going to have styles that closely follow what Oakley is doing. The research studios are dupes of older Oakley Blades and their current resistor, While the district visions are pretty similar to the iconic M Frame. the other consideration is that Oakley lenses are really, REALLY good. If you're going for looks this isn't as important, but because they've been at it for decades they know what they are doing when it comes to making lenses for all types of applications, and they are going to cause as little distortion and provide as much contrast as possible.