Analysis of Refractive Error after Cataract Surgery According to the Haptic Shape of Intraocular Lens

Abstract

Purpose: To analyze and compare changes in refractive error according to different haptic intraocular lenses after cataract surgery.Methods: We retrospectively reviewed the medical records of 508 eyes of 254 patients who underwent cataract surgery in both eyes, with the MBI<sup>®</sup> SAL302AC (C loop haptic intraocular lens [IOL]) used in one eye and the Zeiss<sup>®</sup> CT ASPHINA509M (plate haptic IOL) in the other. Using the Barrett Universal II formula, prediction errors were calculated at 1 week, 2 weeks, 1 month, 2 months, and 6 months after surgery.Result: In the C loop group, prediction error was -0.26 ± 0.42 diopter (D) and -0.17 ± 0.45 D at weeks 1 and 2 postoperatively, respectively. Hyperopic shift, which reduced myopia, progressed until 2 weeks postoperatively (p < 0.001), after which there was no significant further shift. In the plate group, prediction error was -0.37 ± 0.45 D at 1 week postoperatively, -0.25 ± 0.44 D at 2 weeks postoperatively, -0.11 ± 0.44 D at 1 month postoperatively, and -0.04 ± 0.44 D at 2 months postoperatively. Hyperopic shift progressed at 2 weeks (p < 0.001), 1 month (p < 0.001), and 2 months (p = 0.02), after which there was no significant further shift. There were no significant differences in the mean or median absolute error at 2 months postoperatively.Conclusions: In both the C loop and plate groups, refraction was myopic at 1 week postoperatively, and then the C loop group progressed to hyperopic shift until 2 weeks postoperatively, and the plate group progressed to hyperopic shift until 2 months postoperatively. At 2 months postoperatively, prediction error of the plate group showed a hyperopic tendency compared to the C loop group, but there was no difference in accuracy based on the absolute error using the Barrett Universal II formula.