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Investigation of postoperative cataract refractive error in the Hill-RBF formula Ver. 3 compared to Ver. 2 and other formulas Toyohiro Tsumura 1 , Keiji Shinohara 1 , Yuka Sogabe 1 1Department of Ophthalmology, Mitoyo General Hospital pp.898-905
Published Date 2023/7/15
DOI https://doi.org/10.11477/mf.1410214854

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Abstract Purpose:To report refractive errors after cataract surgery with implantation of intraocular lens(IOL)using Hill-RBF Ver. 3 which was released in December 2020, Ver. 2 and other formulas.

Cases and Method:This study involved 344 eyes of 200 patients who received cataract surgery from October 2018 to April 2020(comparison with Hill-RBF Ver. 2)and 434 eyes of 258 patients from May 2020 to February 2022(comparison with other formulas). Actual refraction was measured one month after surgery and was compared with the predicted value after Hill-RBF Ver. 3, Ver. 2, SRK/T, Haigis and Barrett Universal Ⅱ(BUⅡ)formula.

Results:Refractive error one month after surgery averaged(absolute averaged)0.18±0.45(0.39±0.29)D for Ver. 2, and 0.22±0.46(0.41±0.30)D for Ver. 3 with no significant difference(p=0.293;t-test, p=0.516;Mann-Whitney U test). In comparison with other formulas, refractive error was 0.14±0.49(0.41±0.31)D for Hill-RBF, −0.05±0.49(0.39±0.31)D for SRK/T, 0.004±0.43(0.34±0.26)D for Haigis, and 0.16±0.47(0.39±0.30)D for BUⅡ. Both mean and absolute values were significantly different(p<0.001;one-way ANOVA, p=0.006;Kruskal-Wallis test). Frequency of refractive error within ±0.25D and ±0.5D was significantly different among the 4 groups(within ±0.25D p=0.005, ±0.5D p<0.001;Cochran's Q test)

Conclusion:Hill-RBF Ver. 3 showed a useful formula with less postoperative refraction error in IOL calculation formula. However, since the current formula has a limit on the refractive setting range, further improvement is required.


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電子版ISSN 1882-1308 印刷版ISSN 0370-5579 医学書院

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