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Comparison of LASIK flap morphology and predictability by WaveLight FS200 femtosecond laser and Moria microkeratome using AS-OCT

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Session Details

Session Title: LASIK: Flap Morphology and Ablation Profile

Session Date/Time: Monday 09/10/2017 | 08:30-10:20

Paper Time: 08:42

Venue: Room 3.6

First Author: : M.Abd El-Radi EGYPT

Co Author(s): :    Z. Eldaly   M. Shehata   M. Nassr              

Abstract Details


To evaluate the LASIK flap thickness predictability, morphology and side-cut angles created by femtosecond laser and microkeratome using AS-OCT.


A prospective, comparative, open-label study was conducted at Tiba Eye Center (private practice), Assiut, Egypt, from January 2016 to April 2016.


Fifty two candidate patients(93 eyes) for LASIK procedure were included and stratified into 2 groups; femtosecond (FS) laser-assisted (Allegretto FS-200) and microkeratome (MK) flap creation (Moria 2). Patients were stratified in each group into 100-110 um (thin) planned flap and 130 um (thick) planned flap. Flap thickness was determined at 5 points. The side-cut angle was measured in 3 directions at the margin interface. LASIK flap assessment was performed 1 month post-operatively by Spectralis AS-OCT.


FS group had relatively even flap and MK group had a meniscus-shaped flap. Mean difference between planned and actual flap thickness were 12.93 ± 8.89 and 19.91 ± 5.77 μm in FS and MK respectively. In thin flap, there was significant disparity between 2 groups (7.80 ± 4.71 and 19.44 ± 4.46 um in FS and MK respectively). In thicker flap, comparable flap thickness was achieved (18.54 ± 9.52 and 20.83 ± 5.99 um in FS and MK respectively). Mean side-cut angle was 74.29 ± 5.79 and 32.34 ± 4.94 degrees in FS and MK respectively.


Comparable flap thickness predictability was achieved in thicker flaps while Femtosecond laser technique yielded a more predictable result in thinner flaps. Though different flap morphology was observed, Femtosecond laser technique didn’t provide clear advantage over Microkeratome regarding final visual outcome.

Financial Disclosure:


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