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Elevation Changes of Central Corneal Surface After Allograft Intracorneal Ring Segment Implantation in Keratoconus

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First Author: F.Keskin TURKEY

Co Author(s):    S. Hacıağaoğlu   C. Tanrıverdi   A. Özpınar   A. Kılıç           

Abstract Details

Purpose:

To analyze and compare changes in anterior and posterior corneal surfaces after allograft intracorneal ring segment (KeraNatural, Lions Vision Gift, Portland, OR, USA) implantation.

Setting:

Istanbul Medipol University School of Medicine, Ophthalmology Department, Istanbul, Turkey

Methods:

This retrospective non-comparative case series included thirty-one eyes of 23 patients with a follow-up of 3 months. Computed tomography scans of anterior and posterior corneal surfaces were obtained preoperatively and postoperatively with a rotating Scheimpflug imaging system (Pentacam, Oculus, Wetzlar, Germany). Anterior maximum elevation (AMaxE), anterior mean elevation (AME), posterior maximum elevation (PMaxE) and posterior mean elevation (PME) at 17 predetermined points in the central-4mm area above the best-fit sphere were analyzed. Values were statistically compared with Paired samples t-test and Wilcoxon signed rank test.

Results:

A statistically significant reduction of AMaxE, AME, PMaxE and PME were observed at 3 months after the surgery. Preoperatively measurements of AMaxE, AME, PMaxE and PME were 33.06±13.01, 10.30±8.73, 68.93±22.34, 23.85±16.14, postoperatively 20.65±11.47 (p<0.001), 6.03±6.97 (p<0.001), 52.55±25.43 (p=0.009), 18.76±13.59 (p<0.001), respectively. In addition, the anterior best-fit sphere (ABFS) and posterior best-fit sphere (PBFS) were flattened significantly at 3 months for both the corneal surfaces after the surgery. Preoperatively measurements of ABFS and PBFS were 7.37±0.49, 5.96±0.36, postoperatively 7.65±0.54 (p<0.001, 6.07±0.43 (p<0.001), respectively.

Conclusions:

Allograft intracorneal ring segment implantation led to statistically significant changes and significant flattening in both anterior and posterior corneal surfaces.

Financial Disclosure:

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