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目的:分析高度轴性近视合并老年性白内障患者白内障术后的屈光误差。方法:选择176只高度轴性近视合并老年性白内障眼,眼轴长度≥26mm,行白内障摘除术3个月以上,测量眼轴长度、角膜屈光度、前房深度和眼屈光度数,计算并比较眼轴长度、角膜屈光度测量误差和SRK-公式计算误差。结果:平均眼轴长度测量误差值为0.53mm,平均角膜屈光度测量误差值为0.46D,导致相应的眼屈光度误差值为0.86D和0.45D。SRK-公式计算的平均绝对屈光误差值为1.12D,屈光误差大于2D者占12.5%。结论:公式计算误差和眼轴长度测量误差是导致术后眼屈光度误差的主要原因,且随着眼轴越长,眼轴长度测量误差越大,公式计算的误差也越大。
Objective: To analyze the refractive errors after cataract surgery in patients with highly axial myopia and senile cataract. Methods: A total of 176 patients with high axial myopia with senile cataract, axial length≥26mm, and cataract extraction more than 3 months were enrolled in the study. The axial length, corneal refractive power, anterior chamber depth and refractive power were measured and compared. Axis length, corneal refractive error and SRK-formula to calculate the error. RESULTS: The mean axial length measurement error was 0.53 mm and the mean corneal refractive error was 0.46 D, resulting in corresponding eye refractive errors of 0.86 D and 0.45 D, respectively. SRK-formula calculated the average absolute refractive error value of 1.12D, refractive error greater than 2D accounted for 12.5%. CONCLUSION: The errors of formula calculation and axial length measurement are the main causes of postoperative ocular refractive error. The longer the axial length, the longer the axial length measurement error, and the larger the error of formula calculation.