Sources of Error in Toric Intraocular Lens Power Calculation

屈光度 倾斜(摄像机) 散光 小学生 角膜 人工晶状体 白内障手术 眼科 均方预测误差 验光服务 光学 数学 折射误差 医学 视力 物理 几何学 算法
作者
Nino Hirnschall,Oliver Findl,Natascha Bayer,Christoph Leisser,Sverker Norrby,Eva Zimper,Peter Hoffmann
出处
期刊:Journal of Refractive Surgery [SLACK, Inc.]
卷期号:36 (10): 646-652 被引量:45
标识
DOI:10.3928/1081597x-20200729-03
摘要

PURPOSE: To evaluate the influencing factors on remaining astigmatism after implanting a toric intraocular lens (IOL) during cataract surgery. METHODS: This retrospective study included parameters that were considered to have an influence on toric IOL power calculation. Therefore, data from the literature and the authors' own data were used. This included axial eye length, anterior chamber depth, central corneal thickness, corneal radii (anterior and posterior), diurnal changes of the cornea, inter-device differences, rotational misalignment of the IOL, tilt and decentration of the IOL, pupil size, angle kappa, and surgically induced astigmatism. Ray-tracing and Gaussian error propagation analysis was performed to quantify the sources of error. RESULTS: In total, 4,949 eyes (4,365 eyes of 42 studies and 584 eyes of retrospectively analyzed study data) were included in the study and the difference vector between aimed and calculated remaining astigmatism was 0.81 diopters (D). The main source of error was the preoperative measurement of the cornea (27%), followed by IOL misalignment (14.4%) and IOL tilt (11.3%). Other factors, such as angle kappa (10.9%), pupil size (8.1%), surgically induced astigmatism (7.8%), anterior chamber depth (7.5%), axial eye length (7.5%), and decentration (5.6%), also contributed to the refractive astigmatic error. CONCLUSIONS: The main source of error in toric IOL power calculation is the preoperative corneal measurement followed by IOL misalignment and tilt. [ J Refract Surg . 2020;36(10):646–652.]
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