One-Year Results of Intrastromal Corneal Ring Segm Implantation (KeraRing) using Femtosecond Laser in Patients with Keratoconus

s t o T b d g t C PURPOSE: To report the results of intrastromal corn ing segment [ICRS] (KeraRing; Mediphacos, Belo H onte, Brazil) implantation using a femtosecond la IntraLase Corp, Irvine, California, USA) in keratoco atients. DESIGN: Retrospective, noncomparative, interventional tudy. METHODS: Thirty-two keratoconic patients (50 eye ho underwent ICRS insertion using a femtosec aser for channel creation and completed at least one f follow-up were included in this study. Uncorre isual acuity (UCVA), best spectacle-corrected vis cuity (BSCVA), refraction, topographic findings, a dverse events were assessed. RESULTS: No intraoperative complications were dem nstrated in this series of patients. At the first post tive day, segment migration to the incision site was n three eyes (6%; early postoperative complication). void melting, we repositioned the migrated segm way from the incision site. Serious second migration ot seen and we did not need to reposition any se gain. At the last postoperative examination, there w tatistically significant reduction in the spherical equ lent refractive error compared with that observed at xamination before implantation (mean standard devition, 5.62 4.15 diopters [D; range, 23.62 to .50 D] to 2.49 2.68 D [range, 11.12 to 3.5 D < .001). The UCVA before implantation was 20 r worse in 47 eyes (94%; range, counting finge 0/30), whereas at the last follow-up examination, 28%) of 50 eyes had a UCVA of 20/40 or better ounting fingers to 20/25). Nine eyes (18%) mainta he preimplantation BSCVA, whereas 39 eyes (68 xperienced a BSCVA gain of one to four lines at t ollow-up examination. Only in two eyes (4%; atients) with advanced keratoconus (stage III) here a decrease of up to two lines. Despite this d ation in BSCVA, the patients did not want to re