Photorefraktive Keratektomie- Verlauf und Unterschiede zu LASIK
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.
Veni Vidi - octors of Ophthalmology
