I think it has to revolve around the idea of a return to normal by general human standards. For the most part, a professional athlete devotes his or her life to being more physically capable than normal human beings, certainly there's natural talent to compliment that, but for most there still has to be a dedication to pushing that talent as far as it will go. A person can train to improve their muscles and reflexes, but eyesight is almost entirely out of their hands. Really, all you can do is try not to damage it and some people will still have it fade rapidly or never have it to begin with. Lasik is a surgery to repair damage, and I suppose that's what it comes down to, surgery is completely legal in baseball, I cannot think of a surgery that would be against the rules. What is illegal is the use of certain drugs, I think the better argument would be against the use of painkillers and anti-inflammatory drugs like cortisone. I agree, that eventually baseball has to bend one way or the other, outlawing all drugs, and then potentially all surgeries in an effort to keep hundred year old records pure, or we can accept that humanity, and the game of baseball itself, is evolving and allow at least the drugs that are considered legal by federal standards. Of course that kind of attitude should extend to other things such as instant replay, robot umpires, a DH in the National League and a restructuring of the divisions to allow for greater competition.