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| A Comparison of the Accuracy of Five Modern Toric IOL Formulas with Average Axial Lengths |
| Bin Hu, Man Hu, Xing Yang, Pingjun Chang, Yalan Wang, Yun'e Zhao |
| Eye Hospital, Wenzhou Medical University, Hangzhou 310000, China |
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Abstract Objective: To compare the prediction accuracy of the Barrett (predicted posterior corneal astigmatism, PPCA), the Barrett (measured PCA, MPCA), the EVO 2.0, the Kane, the Næser-Savini toric intraocular lens (IOL) power formulas of toric IOL refractive outcomes in eyes of average axial lengths. Methods: This retrospective consecutive case study included 304 patients (304 eyes) who underwent microincision phacoemulsification and AcrySof toric intraocular lens implantation from May 2015 to June 2021 at the Eye Hospital ,Wenzhou Medical University at Hangzhou. Using vector analysis, the astigmatism prediction error (PE), the mean absolute prediction error (MAE), the median absolute prediction error (MedAE), the standard deviation of the prediction error, and the percentage of eyes with PE within ±0.25 diopter (D), ±0.50 D, ±0.75 D and ±1.00 D were calculated. The differences between the MAE between formulas was assessed using the nonparametric Friedman test. Results: The Kane formula showed astatistically significantly lower MAE (P<0.001) comparing with all other formulas. The Kane formula showed the highest proportion of eyes with PE within ±0.50 D with 54%, followed by the Næser-Savini formula (47%), Barrett (MPCA) formula (44%), Barrett (PPCA) formula (42%), and EVO 2.0 formula (39%). No statistically significant difference existed among the MAE calculated from the N?ser-Savini, Barrett (MPCA), Barrett (PPCA)and EVO 2.0 toric formulas. Conclusion: Compared with the Barrett (PPCA), Barrett (MPCA), Næser-Savini, and EVO 2.0 toric formulas, the application of Kane calculator in calculating toric IOL dioptor could reduce PE and improve toric IOL refaractive outcomes.
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Received: 02 June 2022
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Corresponding Authors:
Yun'e Zhao, Eye Hospital, Wenzhou Medical University, China (Email:zyehzeye@126.com)
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