Selective Corneal Aberrometry (SCOA) after Laser-assisted Subepithelial Keratectomy (LASEK) in High Myopia
Herrmann A., Bende T., Jean B.
Experimentelle Ophthalmo-Chirurgie, Universitäts-Augenklinik, Abt. I, Tübingen
Purpose: The ablation zone diameter correlates with ablation depth. This is particulary important in correction of high myopia. In LASEK procedures, the ablation zone diameter can be maximal, while in LASIK, it may be limited by corneal or residual stromal thickness. Selective corneal aberrometry (SCOA) allows to asses the resultant functional optical zone objectively. We report on the clinical outcome, the functional outcome (SCOA) and the visual rehabilitation after LASEK in patients with high myopia.
Method: In a retrospective case study, eyes with high myopia (range -6 to -9 D) treated with SCHWIND ESIRIS flying spot laser were reviewed. The ablation zone was 6,5 mm and the ablation rate 0,55 µm. The mean preoperative spherical equivalent was -8 D. Follow up was up to 12 months. Uncorrected visual acuity (UCVA), manifest refraction, selective corneal aberrometry (functional zone, surface quality map and modular transfer function [contrast] and occurance of corneal haze according to Fantes et al. 1990) were assessed.
Results: Twelve months post Lasek no eye lost lines of BSCVA. All eyes showed at least 12/20 USCVA. The mean time of epithelial healing was 5 days (range 4 to 10 days). The functional optical zone was inversely correlated to the amount of correction. For daylight conditions, no significant change in contrast was noticed postoper
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