Laser removes corneal tissue without constructing a flap. Tissue is removed from the corneal surface.
No flap is made, eliminating the risk of ' flap related' complications.
Removing surface corneal tissue can lead to 'hazy vision' in those with a high refractive error ( more tissue is removed). For this reason, PRK is more suited to patients with no more than -6D of refractive error.
The healing process can take several months with refractive changes taking place during that time. The eye will be sore for up to 4 days and there may be some return of the long or short sight over time.