Long-term outcomes of the aphakic snap-on Boston type I keratoprosthesis at the Bascom Palmer Eye Institute

Allister Gibbons,1 Ella H Leung,1 Luis J Haddock,1 Carlos A Medina,1 Viviana Fernandez,2 Jean-Marie A Parel,1,2 Heather A Durkee,2 Guillermo Amescua,1 Eduardo C Alfonso,1 Victor L Perez1,3 1Bascom Palmer Eye Institute/University of Miami Miller School of Medicine, Miami, FL, 2Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL, 3Ocular Surface Center, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL, USA Purpose: To determine the indications, long-term clinical and visual outcomes, and complications of the aphakic snap-on type I Boston keratoprosthesis (KPro). Design: Retrospective, non-comparative case series. Methods: Forty-five eyes of 43 patients with type I aphakic snap-on KPros with at least 1 year of follow-up were included. The past medical histories, preoperative indications, best-corrected visual acuities (BCVAs), postoperative complications, and retention rates were analyzed. Results: The most common indication for KPro implantation was a failed corneal graft (89%). The mean preoperative BCVA was count fingers–hand motion (2.14±0.45 logarithm of minimum angle of resolution [logMAR]), which initially improved to 20/200 (1.04±0.85 logMAR; P