Surgical approach affects intraocular lens decentration.

Abstract

This study aims to quantify and identify risk factors for intraocular lens (IOL) tilt and decentration early after surgery using Scheimpflug imaging. We prospectively included 268 eyes of 253 patients who underwent uneventful cataract surgery and one-piece IOL implantation using a superior or temporal approach. Scheimpflug imaging was used to evaluate the tilt and decentration of IOLs at 1week, 1month, and 3months postoperatively. Differences in IOL tilt and decentration between the approaches were examined. Correlations of age and axial length with the magnitudes of IOL decentration and tilt were also examined. In total, 139 right and 129 left eyes were included. IOL displacement averaged 150μm upward and 150μm to the nasal side of the pupil. Over 50% of the eyes were tilted upward and approximately 90% to the temporal side. The surgical approach was significantly associated with horizontal decentration in both eyes, but significantly associated with only vertical decentration in the right eye 1week postoperatively. In the left eyes, IOLs were shifted to the nasal side in 57.1% and 36.8% of the eyes that received the temporal and the superior approach, respectively, compared with 75.8% and 50% in the right eyes. The differences were significant only at 1-week follow-up (p=0.035 and p=0.003, respectively). Age or axial length was not associated with IOL tilt or decentration in either eye. Scheimpflug imaging can be used as a quantitative tool to evaluate IOL position. The incision site affected the IOL position, this finding was significant at 1week postoperatively only.