Accuracy of intraocular lens diopter calculation for high myopia with cataract

中华眼外伤职业眼病杂志 Pub Date : 2019-11-25 DOI:10.3760/CMA.J.ISSN.2095-1477.2019.11.006

Jun-zheng Dong

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Abstract

Objective To compare the calculation accuracy with three different intraocular lens (IOL) diopter formulas for high myopia with cataract. Methods The data of 172 eyes of 172 patients with high myopia with cataract from Feb. 2017 to Nov. 2018 in this hospital were analyzed retrospectively. All cases were divided into 3 groups according to axial length (AL). AL of group A was 26.1-28.0 mm, 28.1-30.0 mm in group B and ≥30.1 mm in group C. The intraocular lens diopter of three groups were calculated with SRK/T, Haigis and Barrett Universal II formulas, respectively. The accuracy of IOL diopter among three formulas were compared in each groups at 1 month postopeeratively. Results The difference of IOL diopter accuracy in group A were not statistically significant among three formulas (P=1.000). The IOL diopter with Barrett Universal II was the most accurate in group B and group C. Barrett Universal II was the highest (70.9%) in eyes with error ≤±0.5 D between actual diopter and expected diopter. The difference was statistically significant among three formulas (χ2=18.801, P=0.000). The difference in percentage of prediction error within ±1.0 D was not statistically significant among the three formulas (χ2=5.007, P=0.082). Conclusion The calculation accuracy of IOL diopter with Barrett Universal II formula is the highest for high myopia with cataract. Key words: Cataract, high myopia; Lens, intraocular; Accuracy, calculation, diopter

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高度近视合并白内障人工晶状体屈光度计算的准确性

目的比较三种不同人工晶状体屈光度公式对高度近视合并白内障的计算精度。方法回顾性分析该院2017年2月至2018年11月收治的172例高度近视合并白内障患者172只眼的资料。所有病例根据轴向长度(AL)分为3组。A组AL为26.1 ~ 28.0 mm, B组为28.1 ~ 30.0 mm, c组≥30.1 mm。三组分别采用SRK/T、Haigis、Barrett通用II公式计算人工晶状体屈光度。比较各组术后1个月人工晶状体屈光度的准确性。结果A组3种配方间人工晶状体屈光度精度差异无统计学意义(P=1.000)。Barrett Universal II型人工晶状体屈光度在B组和c组最准确，Barrett Universal II型人工晶状体屈光度与预期屈光度误差≤±0.5 D时最高(70.9%)。3种配方间差异有统计学意义(χ2=18.801, P=0.000)。3种公式预测误差在±1.0 D范围内的百分比差异无统计学意义(χ2=5.007, P=0.082)。结论巴雷特通用型人工晶状体屈光度公式对高度近视合并白内障患者的计算精度最高。关键词:白内障;高度近视;镜头,眼内;精度，计算，屈光度

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