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目的:通过比较采用游标卡尺测量角膜直径换算角膜屈光度与角膜曲率计直接测量角膜屈光度对人工晶体(IOL)度数测量的准确性,评价游标卡尺测量法的临床应用价值。方法:将200例患者随机分为A、B两组,每组各100例(100只眼),A超测出眼轴长度后,A组应用游标卡尺测量角膜直径换算角膜屈光度,B组应用角膜曲率计直接测量角膜屈光度,然后使用SRK公式计算IOL度数。对患者施行小切口白内障摘除术后,按照测出的IOL度数植入IOL。术后3个月随诊检查视力及眼屈光度。结果:术后3个月两组患者大部分获得良好的屈光状态及裸眼视力,A组术后屈光不正>±2.00D者3例,占3%,B组术后屈光不正>±2.00D者2例,占2%。两组对比差异无统计学意义(P>0.05)。结论:利用游标卡尺测量角膜直径换算IOL度数法具有实用价值,值得临床推广应用。
OBJECTIVE: To evaluate the accuracy of the IOL measurement by comparing the corneal diameter with corneal diameter measured by vernier caliper and corneal curvature meter, and to evaluate the clinical value of vernier caliper measurement. Methods: A total of 200 patients were randomly divided into two groups (A and B), 100 cases in each group (100 eyes). After axial length was measured by A-scan, corneal diameter was converted to corneal refractive index using a vernier caliper in group A, cornea The cornea measures the corneal power directly, and then uses the SRK formula to calculate the IOL power. After a small incision cataract surgery on the patient, the IOL is implanted according to the measured IOL. Follow-up 3 months after surgery to check visual acuity and refractive power. Results: Most patients in both groups got good refractive status and uncorrected visual acuity after 3 months. In group A, there were 3 cases (> 3%) with postoperative refractive error> ± 2.00D, and postoperative refractive error> 2.00D in 2 cases, accounting for 2%. There was no significant difference between the two groups (P> 0.05). Conclusion: It is of practical value to measure the corneal diameter using the vernier caliper to convert the degree of IOL, which is worthy of clinical application.