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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

Purpose:

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

Setting:

Chicago Eye Institute, Chicago, USA.

Methods:

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.

Results:

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.

Conclusions:

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.

Financial Disclosure:

NONE

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