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

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

Purpose:

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

Setting:

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

Methods:

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.

Results:

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.

Conclusions:

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:

NONE