Once again proving my ability to procrastinate:
Laser eye corrective surgery, LASIK, has a really high success rate. It's probably one of the highest success rates for corrective surgery in the entire medical literature. However, there's this huge stigma behind it that you could go blind or people end up with worse eyesight and so on and so forth. The official statement is that chance is 2-5%.
So, I ask you this. Assuming the following conditions:
1. You're unbelievably rich to the point where your child can buy a Ferrari with the money obtained from rooting through your couch.
2. The operation is not critical to your health, but will improve your standard of living greatly if it succeeds and make you regret your birth if it fails. If you could put it in numbers, you'd be 30% happier with your life with a successful operation and probably 100% unhappier with your life with a failed operation.
If someone told you your boob job / nose job / LASIK / skin graft / etc. had an X percentage chance of failure, what would that X be for you to live with your minor improvishment?
Personally, if I could afford it, I'd do the LASIK surgery. It's not a cosmetic thing for me like a boob job or whatever as there's a lot of things I cannot do with glasses. I have very very strong flinch reflexes which make wearing contacts nearly impossible (I can't even put eyedrops in my eyes properly). I can't go deep sea diving, can't do most sports that need protective eyewear, etc. When you can barely make out the faces of people standing 1 meter from you without glasses, it gets really irritating.
And 98% chance of success is very good for me. I'm sure you all know this, but I don't think the concept of "risk averse" applies to people like me. Heck, I'd do it if there was a 40% chance of success, as that's my cutoff point.