To Compare The Morphological And Biomechanical Outcomes Of Femtosecond Laser-Assisted In Situ Keratomileusis (Fs-Lasik) Using The Visumax-500-Mel90 And Wavelight Fs200-Ex500 Lasers.
Published 2024 - 42nd Congress of the ESCRS
Reference: PP15.14 | Type: Free paper | DOI: 10.82333/np5r-t019
Authors: Venkatesh Antalmarad* 1 , Venkatesh Antalmarad* 1
1Ophthalmology,All India Institute of Medical Sciences,New Delhi,India
Purpose
To compare the morphological and biomechanical outcomes of Femtosecond Laser-Assisted In Situ Keratomileusis (FS-LASIK) using the VisuMax-500-Mel90 and Wavelight FS200-EX500 lasers.
Setting
Dr. Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi.
Methods
A total of 112 eyes were randomized into two groups. Group 1 underwent FS LASIK with VisuMax-500-Mel90 and group 2 underwent FS LASIK with Wavelight FS200- EX500. Pre- and post-operative evaluations included assessment of LASIK flap morphology using ASOCT (OptoVue RTVue), corneal biomechanical parameters using Corvis-ST, visual quality using ray tracing aberrometry (iTrace), anterior chamber angle anatomy using SSOCT (CASIA2), posterior segment changes using SSOCT- TOPCON (DRI OCT Triton (plus)). Follow up was performed at post op 1week, 1 month and 3 months.
Results
VisuMax-500 had shorter suction time (23.53 ± 0.27 sec) than Wavelight FS200 (72.01 ± 9.86 sec). Targeting a 100 μm flap thickness, Visumax-500 had central flap thickness of 107.86 ± 6.81 μm, Wavelight FS200 had 100.25 ± 6.82 μm. Mean flap thickness: VisuMax-500 (116.21 ± 5.68 μm), Wavelight FS200 (106.40 ± 7.11 μm). Post-op, both groups showed significant changes in corneal biomechanical parameters, decreased bIOP at three months. Visual quality parameters remained stable, but alterations in total and 5cpd MTF cornea were significant. Endo-ACD decreased significantly in both groups. Posterior segment imaging showed increased dimensions of bursa premacularis and area of martegiani at 1 and 3 months, without complete PVD signs.
Conclusions
The Wavelight FS200 group demonstrated central and mean flap thickness closer to the intended values, indicating greater precision and a more planar configuration compared to the VisuMax-500 group, which exhibited less predictability and a meniscus-shaped configuration. Both groups had comparable visual outcomes.