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I've always wondered whether a lasik operation is safe or risky. I've searched the net and obviously there are those who are in favour of it and others who are against it. What are its advantages?
It's relatively safe and the advantage, obviously, is that you don't need to wear glasses or contacts after it.
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What are its bad effects? Can it lead to blindness by any chance?
The only way it can lead to blindness is if the procedure is screwed up very badly and even then you would only lose one eye. It is always done one eye at a time and you have to have correctable vision in both to be eligible.
The perfect outcome won't have any downsides. With less than perfect outcome it could correct your near-sightedness, but introduce halos, glare and similar issues. Some people lose the correction after several years (as methos mentioned) and either end up with glasses again or need to have it re-done.
You asked for opinions. I am not interested in the surgery at all, because contact lenses work very well for me. Acuvue now has two-week disposables that are approved for and safe to wear overnight. I don't bother with taking them out for shower either (in theory you are supposed to) and have had zero problems in 5 years. If you are now stuck with glasses, I would highly recommend trying contacts before you even think about surgery.