I have to chime in on this as well. I got my first pair of Oakleys in 1997, I had two pairs of Ray-Bans, a pair of Nikes, and I've since worn both Smith and Spy. All manufacturers are held in high regard. While I was in High School, before I had my first pair of Oakleys, My vision was 20/20. My vision as of last year was 13/15. My vision has had a documented improvement in the course of my military career. It hasn't been as radical as since school to recently, but my ability to distinguish between close shades of color has also improved. My eyes are also much more sensitive to light than they were, to the point that ambient light on a cloudy day makes me have to squint if I don't have sunglasses. I can also see much better in the dark. My vision has become so sensitive that I can see at night, but no longer in the day. That may be one of the motivating factors in the size of my collection. The point of the story is that I have proof that my vision has grown much more acute over the past 13 years, and I started wearing Oakleys 13 years ago. I understand that commonality in no way indicates causality, but even the friends for which I've given Oakleys as a gift, they have reported better vision in as little as a few months.