Comparison of Laser In Situ Keratomileusis Flap Morphology and Predictability by WaveLight FS200 Femtosecond Laser and Moria Microkeratome: An Anterior Segment Optical Coherence Tomography Study
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Purpose: To evaluate laser in situ keratomileusis (LASIK) flap thickness predictability and morphology by femtosecond(FS) laser and microkeratome (MK) using anterior segment optical coherence tomography. Methods: Fifty-two candidates for the LASIK procedure were stratified into two groups: FS laser-assisted (AllegrettoFS-200) and MK flap creation (Moria 2). Flap thickness was determined at five points. The side-cutangle was measured in three directions at the margin interface. LASIK flap assessment was performed onemonth postoperatively by Spectralis anterior segment optical coherence tomography. Results: Fifty-two patients (93 eyes) were recruited; 49 eyes were stratified to the FS group and 44 eyes to theMK group. The FS group had relatively even flap configurations, and the MK group had meniscus-shapedflaps. Mean differences between planned and actual flap thickness were 12.93 ± 8.89 and 19.91 ± 5.77 μm inthe FS and MK groups, respectively. In thin flaps (100 to 110 μm), there was a significant disparity between thetwo groups (7.80 ± 4.71 and 19.44 ± 4.46 μm in the FS and MK groups, respectively). However, in thicker flaps(130 μm), comparable flap thickness disparity was achieved (18.54 ± 9.52 and 20.83 ± 5.99 μm in the FS andMK groups, respectively). Mean side-cut angle was 74.29 ± 5.79 degrees and 32.34 ± 4.94 degrees in the FSand MK groups, respectively. Conclusions: Comparable flap thickness predictability was achieved in thicker flaps (130 μm), while the FS lasertechnique yielded a more predictable result in thinner flaps (100 to 110 μm). Different flap morphology wasobserved in meniscus flaps in MK-LASIK and flap morphology in FS-LASIK.
Abstract
Purpose: To evaluate laser in situ keratomileusis (LASIK) flap thickness predictability and morphology by femtosecond(FS) laser and microkeratome (MK) using anterior segment optical coherence tomography. Methods: Fifty-two candidates for the LASIK procedure were stratified into two groups: FS laser-assisted (AllegrettoFS-200) and MK flap creation (Moria 2). Flap thickness was determined at five points. The side-cutangle was measured in three directions at the margin interface. LASIK flap assessment was performed onemonth postoperatively by Spectralis anterior segment optical coherence tomography. Results: Fifty-two patients (93 eyes) were recruited; 49 eyes were stratified to the FS group and 44 eyes to theMK group. The FS group had relatively even flap configurations, and the MK group had meniscus-shapedflaps. Mean differences between planned and actual flap thickness were 12.93 ± 8.89 and 19.91 ± 5.77 μm inthe FS and MK groups, respectively. In thin flaps (100 to 110 μm), there was a significant disparity between thetwo groups (7.80 ± 4.71 and 19.44 ± 4.46 μm in the FS and MK groups, respectively). However, in thicker flaps(130 μm), comparable flap thickness disparity was achieved (18.54 ± 9.52 and 20.83 ± 5.99 μm in the FS andMK groups, respectively). Mean side-cut angle was 74.29 ± 5.79 degrees and 32.34 ± 4.94 degrees in the FSand MK groups, respectively. Conclusions: Comparable flap thickness predictability was achieved in thicker flaps (130 μm), while the FS lasertechnique yielded a more predictable result in thinner flaps (100 to 110 μm). Different flap morphology wasobserved in meniscus flaps in MK-LASIK and flap morphology in FS-LASIK.
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