I wear my glasses under my Flexs and I've never really had a problem with the lenses on my glasses steaming up. The only time i have ever had a problem has been when I was out Marshalling once in the pouring rain and I had my hoddie pulled up over my head, was to be expected really. Because of the lack of problems I've never seen the need to bother with any 'anti fog' application, I'd see how you go at first and avoid putting stuff on as a matter of course. My glasses aint particually thin, the lenses are plastic and they have both an anti-reflective and anti scratch coating. Gonna hopefully get a set of profilers soon and I doubt I'll have any problems with my glasses steaming up with them either.
Laser Eye surgery....hmmmm.....Although the majority of patients achieve success there are still quite a lot of less than 100% successes. Sometimes the treatment will degrade over time resulting in the patient having to go back to glasses or contacts. Also, the long term effects haven't quite been proven yet, although I'm fairly seriously short sighted I'm not quite willing to put my sight on the line just yet. I'm gonna give it a few more years, let the technology stabilise a bit more.
Contacts might be a good option as far as when you are playing. I personally would recommend avoiding gas permeable (hard) lenses. I had them a few years ago and the comfort level could be likened to shoving shards of glass in ones eyes. Recently soft lenses have developed to a degree where I could actually use them, I have quite serious astigmatism and previously they would not have been able to correct my vision substantially. Daily disposables aren't even an option for me as they are not available in anywhere near the prescription that I would require (yet). Currently it's a case of trying to get a decent enough income in whereby I could afford the monthly soft lenses.
Hmm........I wonder if I'd keep my paintball moniker if i lost the specs....