Impact Of Icrs Implantation On Corneal Biomechanics And Its Correlation With Functional Outcomes
Published 2023 - 41st Congress of the ESCRS
Reference: PO0705 | Type: Free paper | DOI: 10.82333/862h-ky37
Authors: João Ramalhão* 1 , João Heitor 1 , André Ferreira 1 , Pedro Baptista 1 , Miguel Neves 1 , Miguel Gomes 1 , Luís Oliveira 1
1CHUPorto,Porto,Portugal
Purpose
To evaluate the impact of ICRS implantation on corneal biomechanics and on functional outcomes and its correlation
Setting
Our reseach was developed at Centro Hospitalar Universitário do Porto.
Methods
Prospective case series study. Twenty-three consecutive eyes with keratoconus submitted to ICRS implantation were included. Best corrected visual acuity (BCVA) and corneal biomechanical evaluation with Oculus Corvis ST were performed one week before and one month after ICRS implantation. The fellow eye was used as control. In all cases, femtosecond laser assisted tunnel creation was used.
Results
Comparing pre and post-op results, BCVA improved from 0.52 ± 0.20 to 0.64 ± 0.20 (p=0.0014). Analyzing Corvis ST parameters, there was a significant reduction of the first deflection time (A1 time), from 7.25 ± 0.27 to 7.18 ± 0.24 ms (p=0.36). This was accompanied by an also significant increase in time for second applanation to occur (A2 time) from 22.4 ± 0.65 to 22.8 ± 0.37 ms (p=0.014). Post-op vs pre-op variation of Corneal Biomechanical Index (CBI) in eyes which improved BCVA (n=16) was 0,005 ± 0.02, while post-op vs pre-op variation of CBI in eyes whose BCVA remain stable or decreased (n=7) was 0.054 ± 0.09 (p=0.054).
Conclusions
ICRS implantation allowed a significant BCVA improvement. There was also a significant impact on corneal biomechanics, namely an overall increase in the viscosity of the system. Regarding the correlation between biomechanical impact and functional outcomes, there was a tendency for a lesser variation of CBI in eyes whose BCVA improved with ICRS implantation.