第三代人工晶状体公式计算非正常眼轴眼人工晶状体度数的准确性

The accuracy of the SRK-T and Hoffer-Q IOL power formulas for patients with high myopia cataract and short eye axis cataract

目的分析第三代人工晶状体(intraocular lens,IOL)计算公式预测非正常眼轴眼IOL度数的准确性。方法对130例(172眼)高度近视白内障患者应用SRK-T公式,28例(36眼)短眼轴白内障患者应用Hoffer-Q公式计算IOL度数,术后3～36个月随访屈光状态。结果高度近视白内障患者随其眼轴长度的增加,术后绝对屈光误差值也逐渐增大(-0.21～1.49D),两者具有相关性(r=0.39,P<0.05);短眼轴白内障患者术后实际屈光力与预计值相差很小,两者差异无统计学意义(P>0.05)。结论第三代IOL计算公式能较准确地测定非正常眼轴眼的IOL度数,可使非正常眼轴白内障患者取得与预期屈光度更接近的屈光效果。

Objective To analyze the accuracy of IOL power formulas （SRK-T and Hoffer-Q） in predicting IOL power for patients with high myopia cataract and short eye axis cataract. Methods One hundred thirty patients （172 eyes） with high myopia cataract and 28 patients （36 eyes） with short eye axis cataract who underwent phacoemulsification and posterior chamber IOL implantation were included in the study. Eyes with axial lengths longer than 26 mm received IOLs whose power was determined by the SRK-T formula. Eyes with axial lengths shorter than 22 mm received IOLs whose power was determined by the Hoffer-Q formula. Three months after IOL implantation, postoperative refractions were recorded and compared to predictive refractions.Patients were followed up for 3 to 36 months. Results In the group of eyes with axial lengths longer than 26 mm, the difference between the postoperative refraction and predictive refraction determined by SRK-T was proportional to axial length （P〈0.05）. There was no statistically significant difference between the postoperative refraction and predictive refraction determined by the Hoffer-Q formula. Conclusion SRK-T and Hoffer-Q formulas are appropriate for high myopia eyes with axial lengths longer than 26.0 mm and eyes with axial lengths shorter than 22.0 mm.