We have found a lot of inconsistent issues with aftermarket lenses. The majority of us will say some lenses are too thick and dont fit in some frames correctly or they are slightly too big and cause the lens to bend creating distortion. Some Xmetal and wire frames that I have tried aftermarket lenses in resulted in the lens being cut too small and it moves within the frame orbital thus it will pop out when you try to clean them. I have seen some lenses with iridium coatings cause the person to see different color spectrums when being worn, not in the realm of gradient dark on top then light on the bottom, I am talking blues and greens as you look through them....