![]() ![]() MS Excel and SIA 2.1 versions calculated a mean SIA magnitude of 0.66 (☐.47) D and 0.64 (☐.55) D respectively. A total of 29 eyes of 25 patients studied with a mean age of 62.55 (☘.08) years, males contributing to 14 (56%), and right laterally in 17 (58%) eyes. Manual keratometry measurements for pre and postoperative horizontal (Kh) and vertical (Kv) curvatures established, and statistical analysis for the resultant SIA magnitude and axis deduced with Medcalc software comparing with the existing SIA 2.1 version calculator. Based on Pythagoras principle, MS Excel calculator designed and the law of cousins for calculating the vector magnitude and axis respectively. ![]() Post-cataract surgery patients from May 2019 to January 2020 at a tertiary medical institution recruited for this present study. Hence, in this study by constructing a novel Microsoft Office Excel 2007 based astigmatic calculator following cataract surgery, analysis on the accuracy and predictability evaluated for the performance. Study of steepening, flattening, clockwise, and counter-clockwise torque effect is indispensable to understand and design surgical induced astigmatism calculator. ![]()
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