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Tomographic outcomes after implantation of Ferrara intrastromal corneal ring segments in keratoconus patients

Poster Details

First Author: L.Torquetti BRAZIL

Co Author(s):    J. Lyra   D. Lyra   G. Ribeiro   R. Leonel   P. Ferrara   A. Machado     

Abstract Details


To analyze and compare changes at the anterior and posterior corneal surface after Ferrara intracorneal ring segments (ICRS) implantation and to correlate these changes with visual outcomes.


1. BRaIN, Maceió, Brazil 2. Paulo Ferrara Eye Clinic, Belo Horizonte, Brazil 3. Centro de Excelência em Oftalmologia, Pará de Minas, Brazil 4. Universidade Federal de Alagoas, Av. Lourival Melo Mota, Km 14, Maceió, AL, Brazil, 57072-970.


This study comprised consecutive keratoconus patients that were implanted with Ferrara ICRS. Complete corneal tomograph scans from the two corneal surfaces obtained with a rotating Scheimpflug imaging system (Pentacam) preoperatively and postoperatively were evaluated. The Wilcoxon test was used to compare groups, and the Pearson’s correlation coefficient was used to correlate matters.


The study evaluated 241 eyes of 182 keratoconus patients. In both corneal surfaces, there were statistically significant decreases in averages of K2, corneal astigmatism, elevation at the apex and at the thinnest point, maximum elevation in the central 4mm, elevation inside the 3 and 4mm zone and at 3mm ring. About anterior surface parameters, a significant decrease was observed in K1, while the asphericity increased. In the posterior corneal surface, no significant changes in K1 and asphericity were observed. Poor correlations were found between visual outcomes and tomographic parameters changes. The best correlation was obtained with the anterior corneal astigmatism.


The implantation of intrastromal corneal ring segments induced statistically significant changes in both corneal surfaces. However, poor correlation between visual outcomes and tomographic parameters was found.

Financial Disclosure:

One or more of the authors receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented

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