短眼轴眼不同人工晶状体计算公式准确性比较

The accuracies of intraocular lens （ IOL ） power calculation formulas in short-length eyes

目的比较A型超声测量下6种现代人工晶状体公式（SKT、HAIGIS、HOFFER—Q、SRK—Ⅱ、HOLLADAY、BKINK-Ⅱ）在短眼轴眼（〈22mm）的准确性应用。方法前瞻性研究短眼轴白内障眼超声生物参数，人工晶状体植入术前使用A型超声仪、角膜曲率计测量术眼的眼轴长及角膜屈光度，术后1个月电脑验光与检影验光相结合的方法测量术眼获得最佳矫正远视力时的实际屈光度数，回输超声测量的眼轴、角膜屈光度及实际使用的人工晶状体度数，并分别计算术眼用这6种公式的预期屈光度数，预期屈光度与实际屈光度之差绝对值，即绝对屈光误差值。结果HAIGIS绝对屈光误差最大（0．9181±0．10691）D（P〈0．01）；其他5种公式比较无统计学意义，但SRK—Ⅱ的绝对屈光误差值最小（0．5088±0．07012）D，但在绝对屈光误差值0—0．5D范围内，SKT公式所占比例最高（34．37％）。结论在目前短眼轴样本量，除HAIGIS外，其他5种公式比较，SRK—II的绝对屈光误差值最小，SKT其次；但在绝对屈光误差0～0．5D范围内，SKT公式所占比例最高（34．37％），可见，SKT公式在短眼轴眼提供最准确的预测屈光度；HAIGIS对术后屈光度影响较大，不适合国人短眼轴眼。

Objective To explore the accuracies of intraocular lens（IOL） power calculations by u-sing 6 formulas （ SKT, HAIGIS, HOFFER-Q, SRK-Ⅱ, HOLLADAY, BKINK-Ⅱ） in Chinese short eyes. Methods Data were prospectively collected by identifying eyes of axial length below 22 mm . The axial lengths and keratometry of the 32 short eyes were measured with ultrasonic scanning before operation, and the actual postoperative refraction was measured with the methods of computer and retinoscopy optometry when patients could gain best corrected visual acuity one month after surgery or later. Inputting the axial lengths, keratometry and IOL powers into ultrasonic scanning , the predicted postoperative refraction was calculated with 6 formulas, and differences of predicted and actual postoperative refraction in short eyes were com- pared. The absolute refraction errors were the absolute value with the difference of the predicted and actual postoperative refraction. Results The differences of the absolute refraction errors were compared, there were no significant differences among 5 formulae except HAIGIS in the short eyes. Absolute refraction errors of the SRK-Ⅱ and SKT were smaller than other formulae. The distribution rate of the absolute refraction er-rors in the SKT formula was the largest from 0 to 0.50 D in Chinese short eyes. Conclutions The SKT for-mula provides the best predictive result of the absolute refraction errors from 0 to 0.50 D in Chinese short eyes . The HAIGIS is the least accurate in 6 formulae in Chinese short eyes.