4种人工晶体度数计算公式预测短眼轴白内障患者术后屈光度的准确性分析

Analysis on the accuracy of 4 formulas for calculating the degree of IOL in cataract patients with an eye with a shorter axial length

目的 比较Barrett UniversalⅡ、SRK-T、Hoffer Q和SRK-Ⅱ4种公式在短眼轴白内障患者中的人工晶体(IOL)度数计算的准确性。方法 回顾性分析沈阳爱尔眼视光医院2018年6月至2019年8月收治的短眼轴眼(<22 mm)的白内障超声乳化人工晶体植入术18例(18眼)的临床资料。计算并比较4种公式预测IOL度数的平均绝对屈光度误差(mean absolute refractive error,MAE)。结果 BarrettUniversalⅡ公式、Hoffer Q公式与另两种公式比较误差较小,差异有统计学意义(F=3.149,P=0.022)。Barrett UniversalⅡ、SRK-T、Hoffer Q和SRK-Ⅱ公式误差在±0.5D以内的比例分别为44.4%、33.3%、38.9%、27.8%。SRK-T公式和SRK-Ⅱ公式误差影响因素为眼轴长度(AL),Hoffer Q误差影响因素为AL和前房深度(ACD),Barrett UniversalⅡ公式误差则不受各因素的影响。结论 对于短眼轴白内障患者,Barrett UniversalⅡ公式及Hoffer Q公式计算IOL度数更为准确。

Objective To compare the accuracy of Barrett Universal Ⅱ,SRK-T,Hoffer Q and SRK-Ⅱ formulas in calculating intraocular lens(IOL) power in patients with short-axis cataracts.Methods Retrospective case-series study.The clinical data of 18 eyes of 18 cases of cataract with a shorter axial length from June 2018 to August 2019 were analyzed.All patients underwent phacoemulsification combined with implantation of intraocular lens.The mean absolute refraction errors(MAE) of the 4 formulas were calculated and compared.Results Compared with the other two formulas,the Barrett Universal II formula and the Hoffer Q formula have smaller errors,the difference was statistically significant(F=3.149,P=0.022).The proportion of errors from Barrett UniversalⅡ,SRK-T,Hoffer Q,SRK-Ⅱ in the range of ±0.50 D was 44.4%,33.3%,38.9%,27.8%,respectively.The factor which affects the MAE of SRK-T and SRK-Ⅱwas AL,those of Hoffer Q are AL and ACD.All of those factors can not affect Barrett UniversalⅡ.Conclusion For patients of cataract with a shorter axial length,the refractive calculation with the Barrett UniversalⅡand Hoffer Q formulas may be more accurate.