Anterior chamber angle width, central vault and intraocular pressure changes after 12 months of Visian collamer lens implantation

Purpose To evaluate 1-year changes of vault, anterior chamber angle width (ACAW) and intraocular pressure (IOP) after the implantation of implantable collamer lens (ICL) V4c in high myopic patients. Methods Sixty ICL V4c implantation surgeries were included. Patients underwent surgery between January 2014 and June 2017 at Ophthalmology Center Tecnolaser Clinic Vision (R), Seville, Spain. All patients had a 12-month follow-up. A preoperative spherical equivalent between - 4.00 and - 15.00 D was established as inclusion criterion. ACAW and vault were measured with Pentacam single rotation Scheimpflug camera (Oculus Optikgerate GmbH, Wetzlar, Germany). IOP was measured with CORVIS ST (Oculus Optikgerate GmbH, Wetzlar, Germany). Results One-day vault was 553.17 +/- 169.80 [268-975] mu m; 12-month vault was 515.67 +/- 176.46 [169-950] mu m (p < 0.01). Preoperative ACAW was 36.85 degrees +/- 4.60 degrees [26.7 degrees-46.8 degrees]; postoperative ACAW was 25.98 degrees +/- 3.85 degrees [16.4 degrees-32.6 degrees] (p < 0.01). Preoperative IOP was 15.37 +/- 1.58 [12.0-18.3] mmHg, postoperative IOP was 15.61 +/- 1.60 [12.0-19.0] mm Hg (p = 0.35). Conclusions ICL V4c lens experienced a progressive reduction of vault after 12-month follow-up. ACAW decrease was significant between preoperative and postoperative values. We propose to include a minimum preoperative ACAW and an IOP correction factor for lens size.