ESCRS - PP20.11 - Allogenic Corneal Ring Segment Implantation For Keratoconus: Corneal Aberration Changes

Allogenic Corneal Ring Segment Implantation For Keratoconus: Corneal Aberration Changes

Published 2022 - 40th Congress of the ESCRS

Reference: PP20.11 | Type: Free paper | DOI: 10.82333/ea9s-hs66

Authors: Zeki Yiğit Karaca* 1 , Suphi Taneri 2 , Cafer Tanriverdi 1 , Şenay Aşık Nacaroğlu 1 , Aylin Kılıç 1 , Fatma Feyza Nur Keskin Perk 1

1Ophthalmology,Istanbul Medipol University,Istanbul,Türkiye, 2Ophthalmology,Zentrum für Refraktive Chirurgie Münster,Münster,Germany

Purpose

This study aims to evaluate high order corneal wavefront (WF) aberrometry changes in eyes implanted with allograft corneal ring segments (KeraNatural) for keratoconus.

Setting

Medipol University Department of Ophthalmology, Istanbul.

Methods

This longitudinal, comparative study includes 30 eyes of 23 keratoconus patients who were implanted with corneal allogenic ring segments.  Corneal WF aberrations at 6.00 mm diameter were evaluated with a Pentacam Scheimpflug camera (OCULUS, Wetzlar, Germany) preoperatively, and at postoperative first and sixth month. 13 of these 30 eyes were followed for 12 months.  Total corneal high order spherical (4,0), trefoil (3, ±3), coma(3, ±1) aberrations, and Zernike coefficients were compared. 

Results

High order spherical, trefoil-30, and coma-90 aberrations were changed significantly at 6 months (p<0.01, 0.01, and <0.01 respectively). The most significant change in spherical aberration and coma-90 was between baseline and postoperative first month(p<0.01). During follow-up, there was no significant change in trefoil-0(p=0.34) and coma-0 (p=0.03). There was no significant change in any high order aberrations that we compared between 6 and 12 months. 

Conclusions

Our study revealed that corneal allogenic ring segment implantation changed spherical, coma-90, and trefoil-30 aberrations significantly at 6 months and that the most significant changes happened during the first postoperative month. There were no significant change in any aberrations after 6 months indicating a stabilization of corneal wavefront aberrations.