Accuracy comparison of different calculation formulas for intraocular lens degree in cataract patients with short axial length under different biometric parameters
·AIM:To compare the refractive prediction accuracy of 7 intraocular lens(IOL)calculation formulas in the cataract eyes with short axial length(AL)at different corneal curvatures and anterior chamber depth(ACD),and analyze relevant influencing factors contributing to prediction errors.·METHODS:A retrospective analysis was performed for 125 patients(125 eyes)with a short AL,who received cataract phacoemulsification at Shenyang He Eye Specialist Hospital from November 2020 to December 2021.According to the keratometry(Km),they were divided into low flat Km group(≤45.5 D),medium and high Km group(45.5 D＜Km＜47 D)and steep Km group(≥47 D);and they were divided into extremely shallow anterior chamber group(≤2.09 mm),shallow anterior chamber group(2.09 mm＜ACD＜2.58 mm)and normal deep anterior chamber group(≥2.58 mm)according to the ACD.And then the median absolute error(MedAE)of EVO,KANE,Barrett Universal Ⅱ,SRK/T,Hoffer Q,Holladay I,and Haigis formulas was calculated and compared,and the correlation between various parameters and prediction error was analyzed.·RESULTS:There was a significant difference in the absolute prediction error of each formula(x2=49.934,P＜0.001)in the overall comparative analysis,and the MedAE of the Barrett Universal Ⅱ formula was the smallest(0.17 D).There were significant statistical differences in the middle-high and steep Km groups(x2=34.372,34.804,all P＜0.001),and the MedAE(0.14 D;0.20 D)of the Barrett Universal Ⅱ formula was the smallest.The absolute prediction error of the 3 ACD subgroups was statistically significant(x2=22.863,25.568,13.647,all P＜0.05),and the MedAE(0.27 D;0.15 D;0.16 D)of the Barrett Universal Ⅱ formula was the smallest.Multiple linear regression analysis showed that Km,AL,and the IOL degree were important correlated factor leading to postoperative prediction error.·CONCLUSION:The accuracy of the Barrett Universal Ⅱformula was higher in the short AL population under different biometric parameters,and AL,Km and IOL degree are closely related to the prediction accuracy.
short axial lengthcorneal curvatureanterior chamber depthformularefractive error
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