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My girlfriend had it done a few years ago. She had very poor vision due to eye damage when she was younger. She couldn't see the clock radio from the bed at night (and it was one of those BIG number ones), read traffic signs, etc.
She flew to LA to have it done and she's very pleased with it. There are some side effects though. One of the most common is astygmatism. She has a very mild case which involves glasses for far away reading, but it is much better than the thick coke bottles she had to wear before.
So it's not perfect by far, but in extreme cases it may be worth it. If it's not extreme, I'd just wait a few years and see how much better it gets.
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