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Repeated Laser Epithelial Keratomileusis (LASEK) for Correction of Residual Myopia after Primary LASEK
1Gabler B., 1Winkler von Mohrenfels C., 2Gora F., 1Hermann W., 1Lohmann C.,
1Universität Regensburg, Klinik und Poliklinik für Augenheilkunde (Regensburg)
2Klinikum der Universität Regensburg, Augenklinik (Regensburg)
Purpose: Laser epithelial keratomileusis (LASEK) is a new technique in refractive surgery for treatment of myopia. The current study addresses the question whether repeated LASEK is a suitable, safe and effective procedure for correction of residual myopia after primary LASEK.
Method: Repeated LASEK was performed in 10 eyes, that had undergone primary LASEK for myopia of ‑2,5 to -8,0 dpt (mean: -5,9 dpt) spherical equivalent refraction, for residual myopia between -1,0 and -1,75 dpt (mean: ‑1,4 dpt) after stabilisation of refraction (retreatment ratio: 4%). The Keracor 117 excimer laser (Chiron Technolas, USA) was used, the exposure time of the alcohol to the corneal epithelium was 30 sec. Follow-up is between 3 and 6 months after repeated LASEK.
Results: Preparation of the epithelial flap succeeded without problems in all 10 eyes. All eyes showed a regular postoperativ course. Postoperativ corneal haze after repeated LASEK was minimal: in 4 eyes no haze was seen, the other eyes showed only a trace of corneal haze. Manifest refraktion was within ±0,5 dpt in all 10 eyes 3 to 6 months after repeated LASEK. Uncorrected visual acuity was 20/20 in 7/10 eyes and no eye lost more than one line of best spectacle-corrected visual acuity.
Conclusions: According to the first results laser epithelial keratomileusis seems to be a safe and effective procedure for correction of residual myopia after primary LASEK. Repeated preparation of the epithelial flap after previous LASEK can be judged as uncomplicated. However long-term results have to be awaited and further studies should also show if LASEK is equally suitable for correction of residual hyperopia.