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. 2016 Jul 18;9(7):1006-10.
doi: 10.18240/ijo.2016.07.12. eCollection 2016.

Comparison of corneal flaps created by Wavelight FS200 and Intralase FS60 femtosecond lasers

Qian Liu  1 , Yue-Hua Zhou  1 , Jing Zhang  1 , Yan Zheng  1 , Chang-Bin Zhai  1 , Jing Liu  1
Affiliations

Comparison of corneal flaps created by Wavelight FS200 and Intralase FS60 femtosecond lasers

Qian Liu et al. Int J Ophthalmol. .

Abstract

Aim: To assess and compare the morphology of corneal flaps created by the Wavelight FS200 and Intralase FS60 femtosecond lasers in laser in situ keratomileusis (LASIK).

Methods: Four hundred eyes of 200 patients were enrolled in this study and divided into Wavelight FS200 groups (200 eyes) and Intralase FS60 groups (200 eyes). Fourier-domain optical coherence tomography (RTVue OCT) was used to measure the corneal flap thickness of 36 specified measurements on each flap one week after surgery. Results were used to analyze the regularity, uniformity and accuracy of the two types of LASIK flaps.

Results: The mean thickness of corneal flap and central flap was 105.71±4.72 µm and 105.39±4.50 µm in Wavelight FS200 group and 109.78±11.42 µm and 109.15 ±11.59 µm in Intralase FS60 group, respectively. The flaps made with the Wavelight FS200 femtosecond laser were thinner than those created by the Intralase FS60 femtosecond laser (P=0.000). Corneal flaps in the 2 groups were uniform and regular, showing an almost planar configuration. But the Wavelight FS200 group has more predictability and uniformity of flap creation. The mean deviation between achieved and attempted flap thickness was smaller in the Wavelight FS200 group than that in the Intralase FS60 group, which were 5.18±3.71 µm and 8.68±7.42 µm respectively. The deviation of more than 20 µm was 0.2% measurements in Wavelight FS200 group and 8.29% measurements in Intralase FS60 group.

Conclusion: The morphologies of flaps created by Wavelight FS200 are more uniform and thinner than those created by Intralase FS60.

Keywords: Fourier-domain optical coherence tomography; Intralase FS60; Wavelight FS200; femtosecond laser; flap; laser in situ keratomileusis.

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Figures

Figure 1
Figure 1. Example of frame-averaged horizontal line scan of corneal images
For each image, the upper numbers represent distances from the central cornea (mm). The lower numbers represent flap thickness and RSB thickness (mm), respectively.
Figure 2
Figure 2. Pupil image showing 0°, 45°, 90°, 135° meridional scans and flap thickness.
Figure 3
Figure 3. The mean flap thickness
The mean flap thickness was 105.71±4.72 µm in WaveLight FS200 group and 109.78±11.42 µm in Intralase FS60 group.
Figure 4
Figure 4. The mean central flap thickness
The mean central flap thickness was 105.39±4.50 µm in WaveLight FS200 group and 109.15±11.59 µm in Intralase FS60 group.
Figure 5
Figure 5. Comparison of flap thickness in the 0° (A), 45° (B), 90° (C) and 135° (D) meridian between Wavelight FS200 group and Intralase FS60 group.
Figure 6
Figure 6. Distribution of the difference between the intended corneal flap thicknesses and the measured flap thicknesses in the Wavelight FS200 group and Intralase FS60 group.
See this image and copyright information in PMC

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