Corneal Biomechanical Changes After Femtosecond Trans-Prk And Lasik- 1 Year Follow-Up
Published 2024 - 42nd Congress of the ESCRS
Reference: PO1252 | Type: Poster | DOI: 10.82333/xksk-s167
Authors: Javier Reyes* 1 , Graciana Fuentes 1 , Francesc Duch 1 , Victor Lazaro 1 , Merce Martí 1
1Refractive Surgery,Institut Català de Retina,Barcelona,Spain
Purpose
Report biomechanical changes 1 year post femtosecond trans PRK(t-PRK) and LASIK (FS- LASIK).
Setting
Institu Català de Retina
Refractive Surgery Department
Barcelona
Methods
Prospective longitudinal study comparing pre and post surgical biomechanical changes, using the Corneal Visualization Schleimpflug Technology (CORVIS ST), in patients undergoing femtosecond trans photorefractive keratectomy (t-PRK) and laser assisted keratomileusis (FS-LASIK).
Pre surgical variables included age, spherical equivalent, optical zone, ablation depth, pachymetry, uncorrected intraocular pressure (UCIOP), biomechanical corrected IOP (bIOP), Radius (R), Peak distance (PD), Deformation Amplitude (DA), velocity 1 (V1), and velocity 2 (V2).
Results
One year follow-up was completed in 54 eyes for the t-PRK group 44 eyes for the FS LASIK group.
In both groups, all variables were statistically significant at 1 year follow-up (t-PRK: bIOP R=0.58, PD R=0.42, DA R =76, V2 R= 0.53; FS-LASIK: UIOP R=0.64, PD R=0.75, DA R=0.71, R=0.52, and V1 R=0.66); except for V2 in the FS-LASIK group (p=0.167). Comparison between 3 and 12 months´ data was not statistically significant, except for both bIOP and UCIOP (p<0.001) in the t-PRK group and UCIOP from the FS-LASIK group (p<0.001).
Conclusions
Significant biomechanical changes were registered, for both groups, after 1-year follow-up,
on all CORVIS ST variables. After 3 months, variables were not significant except for bIOP in the t-PRK group,and UCIOP in both groups. In addition, bIOP was significantly lower for the FS-LASIK group.
Strongest correlations were found for DA after t-PRK and PD, DA and UIOP in the FS-LASIK group.