The visual quality after implantation of multifocal intraocular lenses in different angle kappa eyes

Abstract

Objective To evaluate the effects of angle kappa on the visual quality of multifocal intraocular lenses (MIOLs). Methods This was a prospective observational study. Forty-seven eyes of 47 patients who underwent cataract phacoemulsification and MIOL implantation in our department were enrolled in the study. The patients were between 46 and 81 years old. All patients were divided into two groups according to their kappa angle size. There were 24 eyes in group A (0<r≤0.17 mm) and twenty-three eyes in group B (0.17 mm<r≤0.40 mm). The follow-up period was 3 months after surgery, and uncorrected distance visual acuity, intermediate visual acuity and near visual acuity were evaluated. All patients were assessed for modulation transfer function (MTF) cutoff, Strehl ratio and contrast sensitivity. The occurrence of adverse visual symptoms and spectacle independence were also recorded. The data were analyzed with an independent t test or χ2 test. Results There was a statistically significant difference between group A and group B in the occurrence of halo (χ2=4.997, P 0.05). Conclusion The angle kappa may have little effect on the visual qualities of MIOLs. However, the angle kappa may be related to adverse visual symptoms. Key words: Phacoemulsification; Lenses, intraocular; Angle kappa; Modulation transfer function; Strehl ratio