Haigis-L公式计算超长眼轴患者所需人工晶状体屈光度精确性的研究

Clinical results in highly myopic eyes using the Haigis-L formula

目的评估Haigis-L与SRK-T人工晶状体计算公式对超长眼轴患者所需人工晶状体度数测算的精确性。方法眼轴长26～33mm的白内障人工晶状体植入术共70例(128眼),随机分为2个大组。分别应用Haigis-L公式和SRK-T公式计算拟植入眼内的人工晶状体的屈光度。术后1个月和3个月行屈光检查以确定测算的人工晶状体屈光度的误差值,行统计学检验。结果按眼轴长度分为5个小组。以Haigis-L公式测算的人工晶状体度数误差值各组情况是:眼轴长度26～27mm组,误差为(0.64±0.21)D;27.01～28mm组为(0.63±0.42)D;28.01～29mm组为(0.82±0.56)D;29.01～30mm组为(0.90±0.18)D;>30mm组为(0.95±0.28)D。上述5个小组,以SRK-T公式测算误差值依次为:(0.51±0.32)D;(0.97±0.82)D;(1.54±0.91)D;(2.25±0.91)D;(2.57±1.03)D。两对应组的误差值进行统计学分析,眼轴长为26～27mm者,两公式测算的人工晶状体度数差异无统计学意义(P>0.05)。眼轴长为27.00以上的各组,Haigis-L公式测算的人工晶状体度数均较精确(P<0.05)及(P<0.01)。结论在眼轴>27mm时,Haigis-L公式测算的人工晶状体度数较SRK-T公式精确。

Objective To evaluate the prediction of refraction using the Haigis-L and SRK/T formula for highly myopic eyes. Methods We studied the intraocular lens power for eyes with 26 to 33 mm ocular axial length. They were randomly divided into two groups by using Haigis-L or SRK/T formulas; and the actual postoperative refractive errors were compared to the predicted postoperative refractive error. Results were also stratified into groups of short, average, medium long, and very long axial length （26 to 27mm, 27. 01 to 28 mm, 28. 01 to 29 mm, 29. 01 to 30mm, and 〉30 mm, respectively）. Results In Haigis - L formula group, the mean arithmetic refractive prediction error was （ -0. 64 0.21 ） D for eyes with 26 to 27 mm ocular axial length, （ -0.63 - 0.42） D for27.01 to28mm, （ -0.82 -0.56） D for28.01 to29 ram, （ -0.90-0. 18） D for29.01 to 30ram and （ -0.95 - 0.28） D for greater than 30mm. In SRK - T formula group, the mean arithmetic refractive prediction error was （ - 0.51 - 0.32 ） D for eyes with 26 to 27 mm ocular axial length, （ - 0.97 ± 0.82） D for 27.01 to28 mm,（-1.54±0.91） D for28.01 to29 mm, （ - 2.25 ±0.91） D for 29.01 to 30mm and （ -2.57 ± 1.03） D for greater than 30mm. There was a statistically significant difference between the groups for eyes with greater than 27 mm ocular axial length （P 〈0.05 and P 〈0.01） except between the groups for eyes with 26 to 27 mm ocular axial length （ P 〉 0. 05 ）. Conclusion The Haigis-L formula demonstrated a satisfactory accuracy to calculate the error of refraction in eyes with greater than 27 mm axial length.