五种公式在短眼轴白内障手术前的应用比较

Comparison on the application of five formulas in cataract patients with short axial length

目的比较5种公式（SRK/ T公式、SRKⅡ公式、Holladay1公式、Haigis公式和Hoffer Q公式）在短眼轴年龄相关性白内障患者手术前，进行人工晶状体屈光度预测的准确性。 方法选择短眼轴（眼轴长度〈22.0 mm）年龄相关性白内障63例（63眼），使用IOL Master进行术前眼生物测量。由同一术者完成晶状体超声乳化联合后房型人工晶状体植入术，无并发症发生。手术后3个月使用电脑验光联合显然验光，以确定术后实际屈光度。分别计算5种公式的屈光度预测值与术后实际屈光度的差值，比较各公式差值之间差别。 结果 Haigis公式与SRK/ T、Holladay 1及Hoffer Q公式之间差异有统计学意义（P〈0.05），其他各公式间差异无统计学意义（P〉0.05）。5种公式预测误差绝对值〈0.5 D、0.5～〈1.0 D及1.0～2.0 D的例数差异均无统计学意义（P〉0.05）。 结论SRK/ T、SRK Ⅱ、Holladay 1和Hoffer Q公式在短眼轴年龄相关性白内障患者人工晶状体屈光度预测中可获得较准确预测结果。

Objective To compare the predicating accuracy of intraocular lens （IOL）power calculations by using five formulas （ SRK-T, SRK-Ⅱ , Holladay-1, Haigis and Hoffer Q ） in eyes of age- related cataract with short axial length before surgery. Methods Sixty-three eyes of 63 cases of age-related cataract with short axial length（ 〈 22.0mm） were collected and their optical biometry were performed by the Zeiss IOL Master before operation. All patients underwent regular phacoemulsification and posterior chamber IOL implantation by the same surgeon. No complication occurred. The actual postoperative refraction was measured with the methods of phoropter and subjective optometry at 3 months after surgery. The differences of actual postoperative refraction predicted and measured with the five formulas among the short axial lengths cases were compared. Results In the short axial lengths cases, the differences between Haigis formula and SRK-T,Holladay-1 ,Hoffer Q were statistically significant （P 〈 0.05 ） , there was no difference among the other formulas （P 〉 0.05 ）. The difference among the five formulas of the number of cases which forecast error was 〈 0.5,0.5- 〈 1.0 D and 1.0-2.0 D was not statistically significant （ P 〉 0.05 ）. Conclusion In the short axial lengths cases, the accuracy of intraocular lens power calculations by using SRK-Ⅱ , SRK-T, Holladay-1 and Hoffer Q is high.