A超和IOL Master测量人工晶状体度数的对比研究

Comparative study of A-scan and IOL Master in measuring intraocular lens power

目的探讨A超和IOL Master测量人工晶状体度数的精确性,为白内障手术提供客观的临床数据。方法选取300例300眼老年性白内障患者,术前采用A超和IOL Master测量眼轴长度、自动验光仪测量角膜曲率,A超组利用自动验光仪的角膜曲率数据,IOL Master组利用仪器自带的角膜曲率数据,均使用SRK-T公式计算需要植入的人工晶状体度数,观察术后3 m的屈光状态,使用自动验光仪检测患者屈光状态并分析。结果所有被列入研究的患眼随机分为A超组和IOL Master组,A超组测得的平均眼轴长度为(23.21±0.59)mm,IOL Master组测得的眼轴长度为(23.22±0.59)mm,两组数据对比差异无统计学意义(P>0.05);利用自动验光仪测量的术前平均角膜曲率为(44.01±1.79)D,利用IOL Master测量的术前平均角膜曲率为(44.13±1.62)D,两者比较差异无统计学意义(P>0.05);A超组和IOL Master组术后的平均绝对屈光误差(mean absolute refractive error,MAE)分别为(0.43±0.26)D、(0.42±0.17)D,两组比较差异无统计学意义(P>0.05)。结论 IOL Master在操作上略优于A超,但在人工晶体度数测量上与A超比较没有发现明显优势,不能完全取代A超,两者结合更能确保人工晶体度数测量的精确性。

Objective By discussing the accuracy of A-scan and IOL Master in intraocular lens power measurement,to offer objective clinical data for cataract surgery.Methods Three hundred patients(300 eyes)with age-related cataract were included in the study.Before surgery,axial length was measured by A-scan and IOL Master respectively and corneal curvature was measured by auto refractometer.A-scan group used the corneal curvature data of the auto refractometer.IOL Master group used the corneal curvature data from the instrument.Intraocular lens power was calculated according to the SRK-T formula.We observed the refractive state of 3m after operation,detected and analyzed the patient s refractive data by the auto refractometer.Results All patients who were included in the study were randomly divided into A-scan group and IOL Master group.The mean axial length was(23.21±0.59)mm measured by A-scan,the mean axial length was(23.22±0.59)mm measured by IOL Master.There was no significant difference between them(P>0.05).The preoperative mean corneal curvature measured by the auto refractometer was(44.01±1.79)D.The preoperative mean corneal curvature measured by IOL Master was(44.13±1.62)D.There was no statistically significant difference between them(P>0.05).The mean absolute refractive error(MAE)in A-scan group was(0.43±0.26)D and in IOL Master group was(0.42±0.17)D.There was no statistically significant difference between them(P>0.05).Conclusion IOL Master group operated slightly better than A-scan group,but we did not find a significant advantage in intraocular lens power measurement with A-scan group.IOL Master may not completely replace A-scan.The combination of the two ensures the accuracy of the measurement in intraocular lens power.