Abstract

SA.27.02

Intralase^® Femto-LASIK with 90µm flap thickness

Kermani O.¹, Gerten G.¹, Lubatschowski H.², Oberheide U.^1
1Augenklinik am Neumarkt, Köln; ²Laser Zentrum Hannover e.V., Hannover

Objective: The incidence of corneal ectasia after LASIK is also related to the residual corneal thickness. Recommendations for the thickness of the stromal bed after ablation vary between250 and 300 µm. Eyes with a corneal thickness below 500 µm should not be treated at all. Modern aspheric ablation profiles require higher ablation depth per diopter correction. This leads to a reduced range of indication in LASIK. Femtosecond laser assisted LASIK allows the preparatiom of defined and standardized, thin flaps with a thickness of less than 100 µm. We present retrospective results of Intralase (60kHz) Femto-LASIK procedures with 90 µm thick flaps.
Methods: 25 myopic and myopic/astigmatic eyes with a SEQ from -9.75 dpt to -2.63 dpt were treated between september and december 2006 with the Intralase^® Femto-LASIK for the treatment of compound myopic astigmatism. The assumed thickness of the flaps was 90 µm. The refractive results 3 months post operative were analysed.
Results: The preparation of the flaps with the Intralase^® succeded in all cases without any complication. The mean thickness of the flap was 95 µm with a standard deviation of ±10 µm. The flap preparation was performed with minimum traction or strictional forces. The refractive results were very satisfying with 90% of the eyes within ±0.5 dpt. All eyes had an uncorrected visual acuity of 0.8 or better already in the first day post-op. 21% of the eyes gained at least one line in best corrected visual acuity and no eye lost more than one line. In only one case occured post-op a discrete development of striae which required treatment.
Conclusions: The Intralase^® Femto-LASIK with a thin flap of 90 µm needs flap preparation with small strictional forces. The flap geometry is very standardized and independent of the corneal curvature. The indication for myopic LASIK can be extended also for the usage of tissue consuming ablation profiles. No noticable flap complications occured.

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