Also there are different procedures:
12. Why IntraLase?
Traditional LASIK is a very good procedure. While the risk of complication is very minimal, all surgery carries some degree of risk. Now, an advanced computer controlled laser technology is available that significantly reduces the risk of complications. It is known as IntraLase.
The IntaLase laser is uniquely safe, uniquely precise, and offers patients predictably better visual results. The advanced IntraLase technology has given many patients more confidence when considering laser vision correction. Surgeons frequently prescribe the INTRALASE™ FS laser because it provides micron level accuracy and significantly reduces the possibility of risk and unpredictable outcomes.
13. How is IntraLase different from traditional LASIK?
LASIK is actually a 2 step process. First, a flap of corneal tissue must be created and then folded back. The cornea is the transparent dome-like structure that covers the iris and pupil of your eye. By creating a flap in the cornea, the surgeon is able to perform the laser vision correction treatment on the inner layer of the cornea, which practically eliminates any patient discomfort and allows for a rapid visual recovery.
Traditionally, the surgeon has created the corneal flap with a hand-held mechanical device which utilizes a surgical blade. This method has worked well over the years; however, the performance of these devices can be unpredictable. And although LASIK complications are rare, this mechanical device is frequently the source for many of the reported complications.
With the IntraLase laser, the surgeon uses the precision of a laser to create the corneal flap. The accuracy of the laser (100 times more accurate than a blade) is unparalleled by any other technology in vision correction surgery. This advanced technology allows the surgeon more control during the procedure, and even allows customization of the corneal flap for every individual patient. Because of its consistent accuracy, IntraLase now makes it possible to treat many patients who were dismissed as candidates for laser vision correction due to thin corneas.
From :
http://www.rahmani.com/faq.html