A超和IOL Master测量人工晶状体度数的差异性研究

Study on the difference of A-scan and IOL Master in measuring intraocular lens power

摘要:

目的：比较A超和IOL Master在人工晶状体度数测量方面的差异性。

方法：选取226例230眼年龄相关性白内障患者，术前分别采用A超和IOL Master测量眼轴长度、自动验光仪测量角膜曲率，使用SRK-T公式计算需要植入的人工晶状体度数，术后3mo使用自动验光仪测量角膜曲率，用综合验光仪检查患者屈光状态并分析。

结果：所有患眼使用A超和IOL Master测得的平均眼轴长度分别为23.48±1.94、23.75±1.96mm，两组数据对比差异有统计学意义(P<0.05)； 随机分组后A超组术前平均角膜曲率为43.94±1.81D，术后为43.98±1.87D，两者比较差异无统计学意义(P>0.05)，IOL Master组术前平均角膜曲率为44.10±1.57D，术后为44.11±1.58D，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0.47±0.27、0.41±0.19D，两组比较差异有统计学意义(P<0.05)。

结论：IOL Master在人工晶状体度数测量中略优于A超测量。

Abstract:

AIM: To compare the difference of A-scan and IOL Master in intraocular lens power measurement.

METHODS: Two hundred and twenty-six patients(230 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. Intraocular lens power was calculated according to the SRK-T formula. Corneal curvature was measured by auto refractometer and the refractive outcome was performed by phoropter three months after cataract surgery.

RESULTS: The mean axial length was(23.48±1.94)mm measured by A-scan and(23.75±1.96)mm measured by IOL Master. There was significant difference between them(P<0.05). After random grouping, the preoperative and postoperative mean corneal curvature in A-scan group was(43.94±1.81)D and(43.98±1.87)D respectively. There was no statistically significant difference between them(P>0.05). And the results were(44.10±1.57)D and(44.11±1.58)D in IOL Master group. There was no significant difference between them(P>0.05); The mean absolute refractive error(MAE)in A-scan group was(0.47±0.27)D and in IOL Master group(0.41±0.19)D. The difference was significant(P<0.05).

CONCLUSION: IOL Master is proved to be slightly more accurate than A-scan for IOL power calculation.