Posterior chamber collagen copolymer phakic intraocular lens with a central hole for moderate-to-high myopia

The purpose of this article is to evaluate the clinical outcomes of a posterior chamber phakic intraocular lens (pIOL) (Visian Implantable Collamer Lens V4c) for the correction of moderate to high myopia in Chinese eyes.The article is designed as a retrospective case series.This study included the first consecutive eyes that had implantation of a new pIOL design with a central hole, at our department by the same surgeon. The safety, efficacy, predictability, stability, and adverse events of the surgery were evaluated over 6 months.The study enrolled 63 eyes (32 patients). The mean spherical equivalent decreased from -12.81 ± 3.11 diopters (D) preoperatively to -0.05 ± 0.27 D 6 months postoperatively; 96.8% of eyes were within ±0.50 D of the target and 100% of eyes were within ±1.00 D. All eyes had a decimal uncorrected distance visual acuity of 0.5 (20/40) or better at every follow-up visit. The safety and efficacy indices were 1.42 ± 0.34 and 1.11 ± 0.19, respectively. Postoperatively, the intraocular pressure (IOP) remained stable over time. No significant rises in IOP (including pupillary block) and no secondary cataract were found. After 6 months, the mean vault was 505.2 ± 258.9 μm (range 120-990 μm), and the mean endothelial cell loss was 2.0%.Implantation of the pIOL was safe, effective, predictable, and stable in the correction of moderate-to-high myopia in Han Chinese patients, even without peripheral iridectomy.