Transepithelial corneal crosslinking using a novel ultraviolet light-emitting contact lens device: a pilot study

Abstract

Purpose: To evaluate the feasibility of a novel, on-eye UVA light-emitting contact lens device driven by fiber optics for the corneal crosslinking (CXL) of patients with keratoconus. Methods: In nine corneal transplant candidates with advanced keratoconus a scleral contact lens reservoir containing 0.007% benzalkonium chloride preserved with 0.25% riboflavin-monophosphatewas placed on the eye for 30minutes. The reservoir lenswas removed and replaced with the CXLens UVA light-emitting contact lens. A 375-nm UVA light at 4 mW/cm2 intensity was delivered for 30 minutes for a dose of 7.2 J/cm2. A one-sided paired t-test was used to evaluate mean differences in maximum keratometry, thinnest corneal thickness, and endothelial cell density between screening and 6 months after CXL. A two-sided paired t-test was used to evaluate differences in bestcorrected distance visual acuity between screening and 6 months after CXL. Results: All patients received the treatment as per protocol and adhered to followup testing. At 6 months after CXL, treated eyes had an average −1.0 ± 1.6 diopters decrease in the maximum keratometry (P = 0.049), a nonsignificant 2.3 ± 7.5 letter improvement in best-corrected distance visual acuity (P = 0.19), a nonsignificant −17 ± 14 μm decrease in thinnest corneal thickness (P < 0.01), and a nonsignificant −86 ± 266 cells/mm2 decrease in endothelial cell density (P = 0.20). Conclusions: Our pilot study demonstrated the feasibility of the novel CXL device for the treatment of keratoconus and indicates the device is ready for larger scale studies with longer follow-up periods. Translational Relevance: The novel CXLens on-eye UVA light-emitting contact lens device offers the potential for efficient, high-throughput transepithelial corneal CXL.