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Investigation of postoperative cataract refractive error in the Kane formula and other formulas Toyohiro Tsumura 1 , Makiko Hirata 1 , Yuka Sogabe 1 1Department of Ophthalmology, Mitoyo General Hospital pp.693-701
Published Date 2024/6/15
DOI https://doi.org/10.11477/mf.1410215193
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Abstract Purpose:To report refractive errors after cataract surgery with implantation of an intraocular lens(IOL)using the Kane formula, which was released in September 2017, and other formulas.

Cases and Methods:This study involved 535 eyes of 535 patients who received cataract surgery from October 2018 to August 2022. Actual refraction was measured one month after surgery and was compared with the value predicted using the Kane formula, SRK/T, Haigis, and Barrett Universal Ⅱ(BUⅡ)formula.

Results:Refractive error one month after surgery averaged(absolute averaged)0.014±0.46D(0.352±0.29D)for Kane formula, −0.050±0.49D(0.380±0.31D)for SRK/T, −0.007±0.43D(0.339±0.26D)for Haigis, and 0.152±0.47D(0.390±0.30D)for BUⅡ. Both the mean and absolute values were significantly different(p<0.001, one-way ANOVA;p=0.042, Kruskal-Wallis test). The frequency of refractive error within±0.25D(±0.5D)was 46.2%(74.8%)for the Kane formula, 42.6%(71.2%) for SRK/T, 44.1%(79.4%)for Haigis, 40.7%(70.1%)for BUⅡ. Within±0.25D, the Kane formula was significantly higher than BUⅡ. Within±0.5D, the Kane formula was significantly higher than SRK/T and BUⅡ. And Haigis was significantly higher than the other three formulas(within±0.25D:p=0.006;within±0.5D:p<0.026, Cochran's Q test).

Conclusion:The Kane formula was the most useful formula with less postoperative refraction error in IOL calculation.


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