Intacs for the correction of keratoconus: Two-year follow-up

Abstract
TING: Service d'Ophtalmologie, CHU Pellegrin, Bordeaux, France. METHODS: This prospective, 2-year follow-up study comprised 100 keratoconic eyes with clear central corneas and contact lens intolerance. The best spectacle-corrected visual acuity (BSCVA), uncorrected visual acuity (UCVA), refractive error, keratometry, pachymetry, and slitlamp examination were assessed preoperatively and 1 and 2 years after Intacs implantation. RESULTS: At 2 years, the UCVA and BCVA improved in 80.5% and 68.3% of eyes, respectively (P<.001). The proportion of eyes with a BCVA ≥0.5 (20/40) increased from 22.0% at baseline to 51.2% and 53.7% at 1 year and 2 years, respectively (P<.001). The manifest refraction spherical equivalent improved from a mean of −6.93 diopters (D) ± 3.91 (SD) preoperatively to −4.01 ± 3.16 D at 1 year and −3.80 ± 2.73 D at 2 years (P<.001). The mean keratometry readings decreased from 50.1 ± 5.6 D preoperatively to 46.4 ± 5.3 D at 1 year and 46.8 ± 4.9 D at 2 years (P<.001). Contact lens tolerance was restored in over 80% of cases. Postoperative slitlamp observations revealed no clinically significant issues. The segments were removed from 4 eyes without complications or sequelae. CONCLUSION: Intacs implantation was a safe and efficacious treatment for keratoconus. Significant and sustained improvements in objective visual outcomes were achieved in most cases, with restoration of contact lens tolerance....