Long-Term Changes in Tilt, Decentration and Anterior Chamber Depth After Implantable Collamer Lens Insertion

ABSTRACT

PURPOSE: To evaluate the stability of implantable collamer lens (ICL, Staar Surgical AG, Niau, Switzerland) by comparing changes of tilt, decentration and anteroir chamber depth after ICL implantation during 1 year. METHODS: The results of 8 high myopic patients (16 eyes) that had received ICL implantation were retrospectively studied. Tilt and decentration of ICL were measured using an anterior eye segment analysis system (Scheimpflug camera, EAS-1000, Nidek, Japan). Anterior chamber depth was measured in both eyes preoperatively and postoperatively by Scheimpflug camera. The follow-up period was 1 year. RESULTS: Tilt was 1.90 +/- 1.23degrees, 1.75 +/- 0.80degrees, 1.64 +/- 0.86degrees, 2.08 +/- 1.33degrees (p = 0.36) and decentration were 0.04 +/- 0.01 mm, 0.03 +/- 0.01 mm, 0.03 +/- 0.02 mm, 0.04 +/- 0.02 mm (p = 0.59) at 1 week, 1 month, 6 months and 1 year respectively. Tilt and decentration showed no significant change after ICL implantation. The average anterior chamber depth was 2.85 +/- 0.26 mm preoperatively, and 2.17 +/- 0.39 mm, 2.06 +/- 0.31 mm, 2.06 +/- 0.34 mm, 2.04 +/- 0.35 mm at 1 week, 1 month, 6 months and 1 year respectively. Anterior chamber depth became narrow after ICL implantation (p = 0.02), but showed no significant narrowing postoperatively (p = 0.08). CONCLUSIONS: The IOL position remained stable, with no significant changes for an extended period of tilt, decentration, or anterior chamber depth after ICL implantation.