Refractive Results after Implantation of Toric Intraocular Lenses Using the Zeiss Callisto System

Background For cataract patients with astigmatism, the insertion of a toric intraocular lens is a safe and effective method to achieve emmetropia. The exact alignment of the lens along the calculated axis is essential for effective correction of astigmatism. The purpose of this study is to evaluate our own data using descriptive statistics. The primary focus is on the refractive outcome and thus the verification of the alignment accuracy of toric IOLs with the Zeiss Callisto system. Patients and Methods The study evaluated a total of 106 eyes of 72 patients who underwent cataract surgery with implantation of a toric intraocular lens at our hospital between January 2019 and December 2020. Preoperative biometry and intraoperative marking of the implantation axis was performed using the Zeiss Callisto system. Postoperative controls were performed after one day, one week and 4 weeks, either at our hospital or by the referring ophthalmologist. For the analysis, only the data of the 4-week control were used. Results In 64 eyes (60%), a Zeiss AT Torbi 709M or MP and in 42 eyes (40%) a PhysIOL Ankoris toric yellow IOL were implanted. In 46 eyes, postoperative uncorrected visual acuity was not recorded. Of the remaining 60 eyes, the mean postoperative uncorrected visual acuity was 0.07 +/- 0.12 logMAR. Postoperative uncorrected visual acuity >= 1.0 (decimal) was achieved in 48% of the eyes and visual acuity >= 0.6 (decimal) in 92%. The postoperative cylinder averaged - 0.65 +/- 0.53 D. The cylinder of the target refraction was - 0.45 +/- 0.39 D on average. The mean of the absolute value of the postoperative cylinder minus the cylinder of the target refraction was 0.42 +/- 0.32 D. Conclusions The Zeiss Callisto system is an effective tool to align toric intraocular lenses.