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Might be because is never more than an equalizer. Theoretically most baseball players, like most human being's eyesight is 20/20, which is generally the target for Lasik if I'm not mistaken. It's not significantly different from a player getting a torn ligament repaired, or bone spurs removed, or having knee surgery or any other kind of procedure to repair something that players can probably play through. It is used to get them back to normal. Unlike PEDs or steroids that can give an already gifted player further advantage in physical strength or recovery times, Lasik cannot be used to give a person that already has 20/20 vision 20/10 or 20/5, or if it can, then that is the case in which it should be disallowed.