Change In Corneal Thickness Within One Year After Allograft Corneal Ring Segment Implantation In Keratoconic Eyes With Oct Measurement

Published 2022 - 40th Congress of the ESCRS

Reference: FPS02.11 | Type: Free paper | DOI: 10.82333/yaps-y079

Authors: Cafer Tanrıverdi* ¹ , Sezer Hacıağaoğlu ² , Suphi Taneri ³ , Munise Altınbaş ¹ , Fatma Feyza Nur Keskin Perk ¹ , Şenay Aşık Nacaroğlu ¹ , Aylin Kılıç ¹

¹Ophthalmology,Medipol University,Istanbul,Türkiye, ²Ophthalmology,Medipol University,ISTANBUL,Türkiye, ³Ophthalmology,Augenzentrum am St. Franziskus Hospital,Munster,Germany

Purpose

To analyze changes within 1 year, thickness of implanted allograft corneal ring tissue, anterior and posterior part of cornea around ring by using anterior segment OCT in eyes with keratoconus.

Setting

Istanbul Medipol University Faculty of Medicine, Department of Ophthalmology

Methods

Thirty-two eyes of 25 keratoconus patients with a mean age of 31.8±8.5 (between 20-52) years were included in the study. Allograft corneal ring segments were full corneal thickness (without epithelium and endothelium) and 2 mm wideness, implanted 35% depth of corneal tunnel created by femtolaser. The thickness of the implanted allograft corneal ring segment, corneal epithelial thickness, and anterior/posterior corneal thickness of the allograft ring segment were measured at 1 day, 1 month, 3 months, 6 months, and 12 months with anterior segment OCT. Changes in the thickness of these tissues within 1 year were analyzed.

Results

There was significant change in corneal tunnel depth between preoperative plan and post-Op 1st day thickness from 210.1 µ to 174.2 µ (P<0.01). There was significant thinning in anterior corneal thickness, ring thickness and posterior corneal thickness respectively P<0.01, P<0.01, P<0.01 within 1 month. There was thinning of the posterior cornea (P<0.01) at 6 months and epithelial thinning at 3 months (P=0.026). There was no significant change observed between 6 and 12 months in all parameters (P>0.05).

Conclusions

We observed that corneal reshaping was stabilized within 6 months after allograft corneal ring implantation in keratoconic eyes and then stabilized until 12 months. Corneal remodeling within 6 months may be related with allograft ring edema, reshaping of elastic corneal ring in the tunnel and epithelial remodeling.