PRK and LASEK
The PRK / LASEK Procedure
Both procedures correct the refractive error by ablation of the corneal surface.
1. 2. 3. 4.
(1) Corneal cell layers, (2) The outer cell layer, the epithelium, is removed and exposes the Bowmann Membrane, (3) The Excimer laser ablation, (4) The epithelium is carefully rolled back. For protection, a soft "therapeutic" contact lens is placed on the eye.
Whereas the older PRK uses a blade to remove the epithelium (the outer corneal surface of the eye), during the LASEK procedure the epithelium is separated with alcoholand carefully rolled up. Next, the excimer laser is used to correct the nearsightedness and/or astigmatism. Finally, the thin epithelium is rolled back in place.
Usually, PRK or LASEK are performed on both eyes on the same day.
A slower postop healing process and sometimes noticeable postsurgical pain are the two disadvantages of PRK and LASEK in comparison to LASIK and Femto-LASIK.