Prospective 2-year study of accelerated pulsed transepithelial corneal crosslinking outcomes for Keratoconus

Aims To report 2-year outcomes of transepithelial, accelerated, pulsed, corneal crosslinking (t-ACXL) for patients with progressive keratoconus. Methods Prospective, interventional case series at a university hospital tertiary referral centre. Forty eyes with progressive keratoconus undergoing t-ACXL were included. Treatment was performed with pulsed illumination (1 s on/1 s off) using 45 mW/cm(2) for 5 min and 20 s, for a surface dose of 7.2 J cm(2). Uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), manifest refraction spherical equivalent (MRSE), corneal tomography, anterior segment optical coherence tomography (OCT) and confocal microscopy were evaluated preoperatively and at 12 and 24 months postoperatively. Results The mean patient age was 23.32 +/- 5.18 years (SD) (range 14-42 years). The mean CDVA significantly improved from 0.38 +/- 0.32 logMAR at baseline to 0.30 +/- 0.21 logMAR at 24 months (P < 0.01). There was no significant difference in UDVA, MRSE, asymmetry indices, tomographic parameters and endothelial density. The improvement in visual acuity was inversely correlated with preoperative CDVA and preoperative K-Max. No complications were encountered. Conclusions In this prospective study, t-ACXL appeared safe and effective in halting progression of keratoconus within a follow-up period of 24 months.