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Investigation of postoperative cataract refractive error in the EVO formula and other formulas Toyohiro Tsumura 1 , Makiko Hirata 1 , Yuka Sogabe 1 1Department of Ophthalmology, Mitoyo General Hospital pp.331-339
Published Date 2025/3/15
DOI https://doi.org/10.11477/mf.037055790790030331
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Abstract Purpose:To report refractive errors after cataract surgery with intraocular lens(IOL)implantation using the EVO formula Ver. 2.0 and other formulas.

Cases and methods:This study involved 317 eyes of 317 patients who underwent cataract surgery from January 2022 to March 2024. The refraction was measured 1 month after surgery and was compared with the value predicted using the EVO formula, SRK/T, Haigis, Barrett Universal Ⅱ(BUⅡ)formula and Kane formula.

Results:Refractive error 1 month after surgery averaged(absolute averaged)0.009±0.36D(0.283±0.23D)for EVO formula, −0.063±0.43D(0.326±0.29D)for SRK/T, −0.082±0.37D(0.301±0.24D)for Haigis, 0.122±0.38D(0.305±0.26D)for BUⅡ and −0.021±0.37D(0.282±0.23D)for Kane formula. Both the mean values were significantly different(p<0.001, one-way ANOVA;p=0.475, Kruskal-Wallis test). The frequency of refractive error within ±0.25D(±0.5D)was 53.6%(87.4%)for the EVO formula, 51.7%(79.8%)for SRK/T, 51.4%(83.0%)for Haigis, 53.9%(81.7%)for BUⅡ and 52.4%(86.1%)for Kane formula. Within ±0.25D, the EVO formula was no significantly different. Within ±0.5D, the EVO formula was significantly higher than SRK/T, Haigis and BUⅡ(within ±0.25D:p>0.448;within ±0.5D:p<0.035, Cochran's Q test).

Conclusion:The EVO formula was the ideal formula to reduce with less postoperative refraction error in IOL calculation.


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