Two-Year Outcomes of Visian Implantable Collamer Lens with a Central Hole for Correcting High Myopia

Purpose. To investigate two-year outcomes of Visian Implantable Collamer Lens with a central hole (ICL V4c) implantation for correcting high myopia. Methods. Sixty-one eyes of 32 patients went through ICL V4c implantation. Safety, efficacy, predictability, and intraocular pressure were evaluated 2 years postoperatively. Anterior chamber volume (ACV), anterior chamber depth (ACD), anterior chamber angle width (ACAW), and vault were measured using a Scheimpflug tomography imaging system. Results. At 2 years, the spherical equivalent refraction decreased from preoperative -14.62 +/- 4.29 D to -0.90 +/- 0.95 D, with 79% of the eyes within + 0.50 I) and 98% within +1.00 D of the intended correction. 'I he efficacy index was 1.03 +/- 0.23, and the safety index was 1.24 +/- 0.26. Corrected distance visual acuity (CDVA) remained unchanged in 23% of the eyes, 75% gained one or more lines of CDVA, and 2% lost one line. The ACV, ACD, and ACAW, respectively, decreased from 193.28 +/- 29.15 mm(3), 3.15 +/- 0.23 mm, and 36.51 +/- 6.54 degree to 112.48 +/- 17.01 mm(3), 2.99 +/- 0.23 mm, and 22.54 +/- 5.27 degree (p = 0.0008, 0.008, and 0.0003, resp.). Intraocular pressure was 15.39 +/- 2.88 mmHg before surgery and was 15.86 +/- 4.11 mmHg at 2 years (p = 0.11). Conclusion. Implantation of ICL V4c is a safe, effective, and predictable procedure for correcting high myopia. Reduction of anterior chamber space after surgery did not induce intraocular pressure increase during the 2-year follow-up.