IOL-Master和A超测量人工晶体度数的两种方法比较

目的比较IOL-Master与A超对人工晶体度数测量的准确性.方法 109例115眼年龄相关性白内障患者,术前分别采用IOL-Master、A超和自动验光仪测量眼部参数,使用SRK-T公式计算植入人工晶体的度数,并将所有眼分为短眼轴组（L≤22 mm）,正常眼轴组（22 mm〈L≤26 mm）和长眼轴组（L〉26 mm）,术后1月检查患者屈光状态并作分析.结果用A超和IOL-Master检测眼轴长度：L≤22 mm组分别为（21.40±0.34）mm和（21.48±0.26）mm,22 mm〈L≤26 mm组分别为（23.65±0.85）mm和（23.67±0.80）mm,L〉26 mm组分别为（29.16±1.83）mm和（29.25±1.91）mm,所有组别两者对比差异无统计学意义（P〉0.05）;术后1个月,A超与IOL-Master测得的术后平均绝对屈光误差值（MAE）比较：L≤22 mm组分别为（0.70±0.49）D和（0.44±0.26）D,22 mm〈L≤26 mm组分别为（0.53±0.46）D和（0.47±0.41）D,L〉26 mm组分别为（0.81±0.49）D和（0.71±0.29）D,所有组别两者对比差异无统计学意义（P〉0.05）;不同眼轴组中,两种方法测得的MAE≤0.50 D及MAE≤1.00 D患者的百分率对比差异无统计学意义（P〉0.05）.结论 IOL-Master与A超在人工晶体测量上具有高度的一致性,是一种高准确性、非接触性、操作简单、安全可靠的人工晶体度数测量工具.

Comparison of IOL-Master and A-scan for Intraocular Lens Power Calculation

Objective To compare the accuracy of IOL-Master and A-scan in biometry and intraocular lens power calculation.Methods 109 patients（115 eyes） with age-related cataract were enrolled in the study.Before surgery,axial length and corneal curvature were measured with IOL-Master,A-scan and auto-refractometer,respectively.IOL power was calculated according to the SRK-T formula.They were divided into three groups by axial length（L≤22 mm,22 mmL≤26 mm,L26 mm）.Refractive outcomes were followed up one month after operation.Results There was no significant difference among three groups in axial length measurement between A-scan and IOL-Master：L≤22 mm：（21.40±0.34）mm vs（21.48±0.26）mm,22 mmL≤26 mm（23.65±0.85）mm vs（23.67±0.80）mm,L26 mm（29.16±1.83）mm vs（29.25±1.91）mm（P0.05）.The mean absolute refractive error（MAE） of three groups had no significant difference between A-scan and IOL-Master：L≤22 mm（0.70±0.49） D vs（0.44±0.26） D,22 mmL≤26 mm（0.53±0.46）D vs（0.47±0.41） D,L26 mm（0.81±0.49） D vs（0.71±0.29） D（P0.05）.Significant difference was also not found of three each group in the proportion of patients whose MAE within 0.5D and 1.0D between the two methods（P0.05）.Conclusions IOL-Master is a non-contact,accurate,safe and reliable tool for IOL power calculation.The preoperative values of biometry and intraocular lens power calculation by IOL-Master and A-scan are almost the same.