Clinical outcomes after implantation of a new intrastromal corneal ring with a 210-degree arc length.

摘要

PURPOSE: To report the clinical outcomes of implantation of a new Ferrara intrastromal corneal ring segment (ICRS) with a 210-degree arc length in eyes with keratoconus. SETTING: Private eye clinic, Belo Horizonte, Brazil METHODS: Statistical analysis included preoperative and postoperative uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), refraction, and keratometry. RESULTS: Eighty eyes (76 patients) were evaluated. The UDVA improved from 20/350 preoperatively to 20/136 postoperatively and the CDVA, from 20/125 to 20/50; the differences were statistically significant (P = .001 and P = .0001, respectively). Corneal tomography (Pentacam) showed corneal flattening in all eyes. The mean preoperative spherical equivalent decreased from -5.22 diopters (D) preoperatively to -2.26 D postoperatively (P = .050); the mean keratometry (K) 1 value, from 51.49 D to 47.40 D (P = .00014); and the mean K2 value, from 54.33 D to 49.14 D (P = .00022). Two patients required penetrating keratoplasty despite ICRS implantation. CONCLUSIONS: A new ICRS with 210 degrees of arc was effective in treating keratoconus. It improved visual acuity and reduced corneal steepening in selected patients.