Therapeutic effect of a new implantation method of rotationally asymmetric multifocal intraocular lenses on visual quality

PurposeTo assess the visual quality after implantation of a rotationally asymmetric multifocal intraocular lens (IOL) using a new method according to the angle kappa.SettingQingdao Eye Hospital, Qingdao, China.DesignProspective case series.MethodsPatients with the implantation of SBL-3 IOLs for age-related cataract from September to December 2019 had the distance-horizontal zone of the IOL placed at the center of the optic axis using the Callisto Eye System. Postoperative visual acuities and defocus curves were recorded. Modulation transfer function cutoff frequency, Strehl ratio, and objective scatter index were measured using the Optical Quality Analysis System. The decentration and tilt of IOLs were analyzed by iTrace aberrometry and anterior segment optical coherence tomography. A questionnaire of patient satisfaction was also collected.ResultsThirty patients (60 eyes) were involved, with a balanced sex ratio. Their average age was 56.04 & PLUSMN; 10.83 years. The average angle kappa distance was 0.23 & PLUSMN; 0.121 mm. At 3 months after surgery, the mean uncorrected and corrected distance visual acuities were 0.01 & PLUSMN; 0.07 logMAR and 0.01 & PLUSMN; 0.06 logMAR. The uncorrected intermediate and near visual acuities were 0.09 & PLUSMN; 0.11 logMAR and 0.09 & PLUSMN; 0.11 logMAR. The mean horizontal and vertical tilts of IOLs were 0.67 & PLUSMN; 0.52 degrees and 0.47 & PLUSMN; 0.32 degrees. The mean decentration of IOLs was 0.17 & PLUSMN; 0.08 mm. Most patients were satisfied with their distance, intermediate, and near vision. There was mild glare in 58.3% of the eyes.ConclusionsLocating the center of the optic axis in the distance-horizontal zone during the implantation of SBL-3 IOLs could provide satisfactory visual acuity and quality.