First Author: J.Ng SINGAPORE
Co Author(s): H. Chan C. Chai L. Thean
Purpose:
To evaluate the accuracy and reproducibility of the LASIK flaps of various thickness produced by the Visumax femtosecond laser system
Setting:
Department of LASIK and Refractive Surgery, National University Hospital Eye Centre, Singapore
Methods:
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.
Results:
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.
Conclusions:
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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