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Accuracy and reproducibility of various central flap thicknesses created with the femtosecond laser in LASIK

Poster Details

First Author: J.Ng SINGAPORE

Co Author(s):    H. Chan   C. Chai   L. Thean        

Abstract Details


To evaluate the accuracy and reproducibility of the LASIK flaps of various thickness produced by the Visumax femtosecond laser system


Department of LASIK and Refractive Surgery, National University Hospital Eye Centre, Singapore


A retrospective review of 209 consecutive eyes of 105 patients who had LASIK flaps created with the 200kHz Visumax femtosecond laser (Carl Zeiss Meditec) was conducted. There were 3 different intended flap thickness (90 ?m, 110 ?m or 140 ?m). The preoperative and intraoperative flap thickness were measured by ultrasound pachymetry. Other parameters recorded included the laser energy, side-cut angle, visual acuity and manifest refraction.


The were 68, 121 and 20 eyes that were intended to have a 90 ?m, 110 ?m or 140 ?m thick flap respectively. The mean achieved flap thickness was 109.17?m ± 22.14 ?m (attempted 90 ?m), 120.63 ± 19.09 ?m (attempted 110 ?m) and 121.92 ± 14.49 ?m (attempted 140 ?m). In the 90 ?m group, the bias was +19.17 ?m and 95.65% of final refraction of the eyes were within ±0.25 D of the intended spherical equivalent. In the 110 ?m group, the bias was +10.63 ?m and 88.43% of eyes were within ±0.25 D of the intended spherical equivalent. In the 140 ?m group, the bias was -18.08 ?m and all eyes were within ±0.25 D of the intended spherical equivalent. There were no statistical significant relationships between the groups of various flap thickness, surgeons, visual and refractive outcomes. There were no flap complications reported.


The Visumax femtosecond laser was able to produce flaps of various thickness safely and within a narrow standard deviation in our patients. FINANCIAL DISCLOSURE?: No

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