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Topographic and visual outcomes after intracorneal ring segment implantation for treatment of progressive keratoconus

Poster Details

First Author: A.Arteaga USA

Co Author(s):    C. Thomas   K. Padilla   C. Kabir   R. Lopez   D. Silva   O. Lopez     

Abstract Details


Evaluate topographic and visual outcomes of patients with progressive keratoconus who were treated with implantation of intracorneal ring segments (INTACS, OASIS�Â�® Medical Inc.).


Chicago Eye Institute, Chicago, USA.


Charts of 162 patients with progressive keratoconus were reviewed and 227 eyes were included. Patients mean age was 37.91 years old (range: 20 - 73 years). All patients had clear central corneas and were contact lens intolerant. Topography, pachymetry, uncorrected (UCVA) and corrected visual acuity (BCVA) was done and analyzed preoperatively and postoperatively, at 1 month, 6 months, 1 year and 3 years. Eyes were classified depending on the number of segments implanted. Paired t-tests assessed changes in logMAR among all patients. Student�â�€�™s t-test, chi-square test for independence, and adjusted odds ratios were reported for differences between segment groups.


INTACS were successfully implanted in all patients. The mean BCVA improved from logMAR 0.3 (SD 0.29) preoperatively to 0.17 ( SD 0.17) at 6 months and 0.18 (SD 0.16) and 0.12 (SD 0.13) at 1 and 3 years respectively. Mean preoperative keratometry decreased from 56.60 (SD 7.97) to 53.27 (SD 6.2) at 6 months and 53.9 (SD 7.14) at 1 year. The odds of having a major improvement in acuity in the first month follow-up was 3.18 greater for those with 1 segment in comparison to those with 2 segments, but no significant difference in long-term follow-up.


The implantation of the ICRS provides improvement and stability of the refractive and topographic measurements in most of the patients. Short term outcomes showed differences between the 2 groups, but we were unable to find this differences in the long-term follow-up. There was no difference in improvement associated with age.

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