ESCRS - FP30.01 - Effect Of Intracorneal Ring Segments On In-Vivo Corneal Biomechanics In Keratoconus: Long Term Results

Effect Of Intracorneal Ring Segments On In-Vivo Corneal Biomechanics In Keratoconus: Long Term Results

Published 2023 - 41st Congress of the ESCRS

Reference: FP30.01 | Type: Free paper | DOI: 10.82333/psk9-xq84

Authors: Riccardo Vinciguerra* 1 , Luis Fernández-Vega-Cueto 2 , José F Alfonso 2

1Humanitas San Pio X,Milan,Italy, 2Fernández-Vega Ophthalmological Institute,Oviedo,Spain

Purpose

The aim of the study is to evaluate the long term effects of the implantation of Intracorneal Ring Segments (ICRS) in keratoconus (KC) on the Dynamic Corneal Response Parameters (DCRs) obtained with the Corvis.

Setting

Fernández-Vega Ophthalmological Institute, Oviedo, Spain

Methods

In this prospective clinical study, we included patients who underwent ICRS implantation for KC over a period of one year. On the day of the surgery and at least 6 months after ICRS implantation, the following measurements were made: Distance corrected and uncorrected visual acuity (DCVA and UCVA), corneal tomography indices with the Pentacam (Oculus, Wetzlar, Germany), biomechanically corrected intraocular pressure (bIOP) and the Corvis DCRs (Integrated Inverse Concave Radius (1/R), Deformation Amplitude ratio (DA ratio), Stiffness Parameter at first applanation (SP-A1), Stress-Strain Index (SSI) and the Highest Concavity Radius (HRC)).

Results

Thirty eyes were included with a mean follow-up time of 15 months. Statistical analysis showed that ICRS implantation induces significant improvements in corneal biomechanics measurements in the long term as demonstrated by a significant increase in SSI (p = 0.004) and a borderline improvement in SP-A1 (p = 0.056).

Conclusions

Patients implanted with ICRS alone for KC showed a significantly stiffer response due to increased structural support compared to preoperative values.