In an ordinary LASIK surgery, a computerized metallic blade is used for cutting the flap of cornea. The lens power is corrected with laser.
A cut on the cornea using a blade may cause problems in the long run as the wounds made by a metallic tool will not join as before thereby weakening the cornea after a few years. However, in the blade-free LASIK method, the surgery is performed using laser beams through a laser window and no wound is created with metallic objects.
In the conventional blade and laser method, there will be a tissue loss of cornea to the extent of 150 microns whereas in the blade-free surgery, it will be only around 80 microns.
In the ordinary blade and laser method, a 270 degree cut (25 mm incision) is made on the cornea whereas in blade-free LASIK, the cut is only of 10 degree which results in a 2 mm laser window.
Moreover, the blade-free LASIK can correct up to 12 dioptre (lens power) while the ordinary LASIK surgery can correct only up to 6 dioptre. For corrections above 12 dioptre, Liqui-gel Contact Lens Implant (Phakic IOL) is used.