I have suffered moderately severe myopia since grade school. Only hard contact lenses provided sharp far-away vision, soft contacts did not do the trick. I have studied corrective eye surgeries for years and have a background in surgery myself. My problem with LASIK and PRK is that permanent, irreversible tissue modifications underly the procedures; in the case of LASIK, tissue is being removed! Also, these corneal modifications can result in less than ultra-clear, sharp vision, what some would call "high definition" vision. For myself, hard contacts provided HD vision, but a the cost of discomfort in windy and/or dusty conditions, not to mention the hassel of caring for contacts while in the mountains.
My recommendation for moderately to severely myopic individuals (-4 or worse) is to seriously consider implantable contact lenses (ICL). I underwent ICL 18 months ago, and I only wish I had done it sooner. The negatives: ICL will not correct astigmatism (there is a new implantable lens that will correct astigmatism and was pending FDA approval at the time of my procedure) and one does not have the option of monocular vision. With ICL, altitude is not an issue, and this procedure is reversible without significant tissue destruction. Most importantly, the results are consistently crystal clear high definition vision, good enough that the procedure is approved for fighter pilots. http://www.visianinfo.com/html/icl-eye-surgery.html