Lenstar LS900测量下人工晶状体公式用于高度近视白内障患者的准确性研究

The Accuracy of Intraocular Lens Formulas Measured by Lenstar LS900 for the Cataract Patients with High Myopia

目的:使用Lenstar LS900测量仪对高度近视合并白内障患者进行术前测量,比较SRK/T、Haigis、Barrett Universal II公式的精确性。方法:选择2018年5月至2018年8月于我院行白内障超声乳化吸除及人工晶状体植入术的高度近视合并白内障患者40例(54只眼),根据眼轴的长度分为三组。使用Lenstar LS900对患者进行眼部生物测量,并计算由SRK/T、Haigis、Barrett Universal II公式预测的术后屈光度。将术后一个月得到的实际屈光度与各公式预测的屈光度进行比较分析,观察上述公式在不同眼轴长度组中的准确性。结果:组内各公式的比较:A组:Haigis公式与Barrett Universal II公式间的差异有统计学意义(P<0.05),其他公式间比较差异无统计学意义(P>0.05);B组:SRK/T公式与Haigis公式比较差异无统计学意义(P>0.05),其他公式间比较差异有统计学意义(P<0.05);C组:三个公式之间的差异均具有统计学意义(P<0.05)。各公式组间比较:SRK/T公式和Haigis公式比较差异具有统计学意义(P<0.05),Barrett Universal II公式组间比较差异无统计学意义(P>0.05)。结论:Barrett Universal II公式用于高度近视白内障患者在各个眼轴长度的测量中表现出良好的准确性,且准确性不随眼轴的增长而下降。随着眼轴的增长,SRK/T公式的准确性逐渐下降,当AL>30 mm时,Haigis公式的准确性优于SRK/T公式。

Objective: To compare the accuracy of SRK/T, Haigis and Barrett Universal II formulas by using Lenstar LS900 for the high myopia cataract patients. Methods: 40 cases(54 eyes) of cataract patients with high myopia who underwent phacoemulsification and intraocular lens implantation in our hospital from May 2018 to August 2018 were divided into three groups according to the axial length. Lenstar LS900 was used to measure the ocular biometrics and calculate the postoperative refraction predicted by SRK/T, Haigis and Barrett Universal II formulas. The actual diopter obtained one month after operation was compared with the diopter predicted by the formulas, and the accuracy of the formulas in different axial lengths was observed. Results: Comparison of the formulas in the groups: In group A, there was significant difference between Haigis formula and Barrett Universal II formula(P<0.05), but no significant difference was found between other formulas(P>0.05);in group B, there was no significant difference between SRK/T formula and Haigis formula(P>0.05), and there was significant difference between other formulas(P<0.05). In group C, the difference between the three formulas was statistically significant(P <0.05). Comparisons among different formulas: SRK/T formula and Haigis formula were statistically significant(P<0.05), but there was no significant difference between Barrett Universal II formula groups(P>0.05). Conclusion: Barrett Universal II formula showed good accuracy in each axial length, and the accuracy did not decrease with the axial growth for the high myopia cataract patients. With the increase of axial length, the accuracy of SRK/T formula decreases gradually. When AL>30 mm, the accuracy of Haigis formula is better than that of SRK/T formula.