Implantable collamer lens with a central hole for residual refractive error correction after corneal refractive surgery

Abstract PURPOSE: To assess the visual and refractive outcomes of an implantable collamer lens with a central hole (ICL V4c) for residual refractive error correction after corneal refractive surgery in individuals with myopia. DESIGN: Prospective, nonrandomized observational case series (self-controlled). METHODS: We investigated 16 eyes of eight consecutive patients with myopia undergoing ICL V4c implantation after corneal refractive surgery. The uncorrected visual acuity (UCVA) and best-corrected visual acuity (BCVA) were examined before surgery and 1 month, 3 months, and 6 months after surgery. We quantitatively assessed the postoperative values of the modulation transfer function (MTF) cutoff frequency, Strehl ratio, objective scattering index (OSI), and OQAS values (OVs) by using an Optical Quality Analysis System. RESULTS: At 6 months after surgery, the mean uncorrected logMAR VA was 0.06 ± 0.10, and the values had improved in 100% of the eyes. The mean MTF cutoff frequency, Strehl ratio, OSI, OV 100%, OV 20%, and OV 9%, were 31.29 ± 4.32 cycles/degree (c/d), 0.18 ± 0.04, 1.469 ± 0.47, 0.97 ± 0.26, 0.75 ± 0.29, and 0.51 ± 0.23 at 6 months after ICL V4c implantation, respectively. CONCLUSION: ICL V4c implantation was safe and effective for the correction of residual refractive error after corneal refractive surgeries, and it had excellent optical performance.