The photorefractive keratectomy (PRK)

Already since the 80’s the PRK is used with ametropia. With lower or medium kinds of ametropia the PRK can correct myopia until about – 6 dioptres and astigmatism until about 3 dioptres. For higher kinds of ametropia the PRK is not suitable.

During the correction the highest layer of cornea - the so called corneal epithelium – is extracted and the deeper located corneal layers are partially abraded by the laser beam. The epithelium of the corneal surface reproduces itself after a few days.

A possible advantage of this method in comparison with LASIK is its simple and long-term proven feasibility. The eyes are treated mostly not simultaneously, but in bigger intervals. However, by the ablation on the corneal surface accrues a very small wound which is healing only after 2 or 3 days and which can also cause aches and pains after the operation. The patient should use eye drops for some weeks in order to avoid a possible cicatrisation and a corneal nebula.