This is a relatively new procedure and predictability is still being assessed.
In Epi-lasik the corneal flap is made up of the superficial layer only and is created by a blunt blade. After the laser treatment the flap of the surface layer is replaced in position. The advantage of this technique is that it can be used in patients with thin corneas. It has all the advantages of LASIK such as faster, pain free recovery but without the disadvantage of cutting deep into corneal tissue. Unlike PRK and LASEK it is relatively pain free.
The procedure has merit and once predictability is established it may replace LASIK as the procedure of choice for treatment of low to moderate myopia and hyperopia.