Christophagust, any eye-doctor who isn't a total fraud will not do th surgery unless your prescription is stable. Most like to see the same prescription for about 2 years or more. Sorry, them just the breaks.
I understand all of you who wouldn't want to mess with your eyes, and I admire those of you who went through with it anyway. Having worn glasses and contact lenses for 15 years before the surgery it wasn't even a question once I understood all the risks. One just has to understand the mechanism of sight and focus in the cornea. Myopia results from a cornea that is too peaked, thus PRK (Photorefractive Keratectomy) and LASIK (Laser in situ keratomesis) attempt to remove some tissue from the cornea to make it more rounded. OU182 described how they do it quite well.
Healing time is faster in LASIK, the can do it with eyes that are much weaker, but there are much more complications. PRK is usually done 1 eye at a time with the second eye coming anywhere from 2 weeks to 2 months later. There is sometimes corneal hazing which can be treated with steroid drops and dry eyes. There is also a tendency in PRK to overcorrect the eyes and fix them properly with steroid therapy later on. You won't see the full results for about 6 months. Plus it hurts like HELL for the first day or two.
My experience with the surgery has made me a believer, but I was already willing to face the risk before I got it done. I chose PRK (which is incidentally alot cheaper) because I wanted to cut down the percentages of the biggest risks.
Surgical eyes is a great site, read that and talk with your doctor. Some vision problems result from higher disorders of the eye that this surgery cannot fix, plus depending on a whole host of other factors (age, prescription, corneal abrasions, etc
the surgery may not suit you.