基层医院人工晶状体度数误差原因分析

目的分析人工晶状体（IOL）度数误差的原因。方法对800例无缝线白内障囊外摘除联合IOL植入术前的白内障患者，应用A超测量眼轴、曲率计测量角膜曲率，根据SRKⅡ公式计算及预设IOL度数，分析其术后的屈光状态与术前IOL度数预设的误差。结果术后3个月非高度近视患者大部分获得良好的屈光状态及裸眼视力；部分患者因术前IOL度数检查误差，术后屈光度在＋3．00-4．00D．结论加强操作人员的技术培训和术前反复、精确测量眼轴长度及角膜曲率（尤其对检查欠合作者及高度近视患者），根据SRKII公式计算，可以提高预设IOL度数的准确性。

An analysis on reasons for IOL power deviation in Grass-roots hospitals

Objective To analyze the reasons for the IOL power deviation in grass-roots hospitals.Methods A-scan ultrasound was implied among 800 cases of the sutureless extracapsular cataract extraction combined IOL implantation to measure the length of ocular axis and keratometer for keratometric power. Then we analyzed the IOL deviation between the preoperative prediction and the post-operative refractive status according to the SPKII formulas for IOL power calculation and the prediction of the IOL power.Results Three months after the sutureless extracapsular cataract extraction combined IOL Implantation, The non-hypermyopia patients are in an ideal refractive status, while the other patients＇ diopters are from ＋3.00D to -4.00D because of the IOL deviation measured before the operations. Conclusion The technical training of the operators should be strengthened. The length of ocular axis and keratometric power of the patients＇ （particularly those without co-operation and the hypermyopia）, should be measured repeatedly and more accurately. Thus, with the help of the SPKII formula, the accuracy of the preoperative prediction of the IOL power can be improved.