the most important for best results, is to choose best professionals. Laser vision correction has always some risk but if company gives a guarantee of the full safety during the surgery ( sometimes you have special insurance) it tells you something about firm. I come from Poland and in my opinion most experienced specialists are in Krakow. I recomend this place is safe and you also might safe.
you might check them here
http://cosmedictravel.com/Centre/10/ophtalmology-clinic-krakow
They have clients from all around the world.