目的:比较使用Lenstar和常规超声测算IOL度数在白内障术后的屈光预测误差(prediction error,PE)。方法:回顾性分析2013-03/06于我院接受白内障手术的年龄相关性白内障患者的单眼数据。术前分别使用A超和角膜曲率计以及Lenstar测量眼生物参数,并使用SRK/T公式进行IOL度数的计算。所有纳入患者接受白内障摘除联合IOL植入术,术中IOL植入囊袋内。术后3mo进行检影验光。比较两种检查方法测量的眼轴及角膜平均曲率,统计分析患者术前及术后视力的变化,术后PE及PE绝对值(absolute value of PE,APE),对PE、APE与眼轴及曲率行相关性分析。结果:术前Lenstar测量眼轴为24.68±1.70mm,A超为24.42±1.65mm,两者间有统计学差异(t=-12.688,P<0.001),同时具有显著相关(r=0.992,P<0.001),两者95%LoA范围为-0.18~0.69mm。术前Lenstar测量角膜平均曲率为44.22±1.03D,曲率计测量值平均为44.19±1.04D,两种方法间无统计学差异(t=-1.241,P=0.217),两种方法间相关性具有统计学意义(r=0.963,P<0.001),95%LoA为-0.52~0.58D。术后Lenstar PE为0.05±0.23D,常规超声测量PE为-0.35±0.76D,两者间有统计学差异(t=-5.494,P<0.001)。使用Lenstar和常规超声APE分别为0.18±0.14D和0.56±0.62D,两种方法间有统计学差异(t=6.379,P<0.001)。结论:Lenstar可进行精确的眼部生物参数测量,术后PE较常规超声明显降低,可用于白内障手术IOL度数的精确计算。 相似文献
Objective To explore the effect of polycythemia on retinopathy of prematurity (ROP).Methods The clinical data of 262 premature cases was analyzed retrospectively in Xi'an Children Hospital from January 2005 to January 2009. Polycythemia was found in 46 cases (17. 56 %), including 27 males and 19 females. In 216 infants without polycythemia (82.46%), 155 were male and 61 were female. The difference of the birth weight (t = 0. 730, P = 0. 466), gestational age (t= 1. 603, P= 0. 110), oxygen inhalation numbers (χ2 =0. 04 ,P>0. 90) and times (t= 1. 225, P= 0. 223), and concentration (t= 1. 823,P=0. 071) between polycythemia group and no polycythemia group were not significant. In order to diagnose ROP, the ocular fundus of all premature infants was examined with binocular indirect ophthalmoscope, and the stage of ROP was assessed. Results In all the premature infants, ROP was found in 120 cases (45.80%). In 46 cases of polycythemia, ROP was found in 25 cases (54.34%); in 216 infants without polycythemia, ROP was found in 95 cases (43.98%); the difference of ROP incidence betweenthe two groups was not significant (χ2=1.64, P>0. 1). In 120 ROP patients, 104 cases (86.67%) with ROP< 3 stage and 16 cases (13.33%) with ROP ≥3 stage were found. In 25 ROP patients with polycythemia, 18 cases (72.00%) with ROP <3 stage and 7 cases (28. 00%) with ROP ≥3 stage were found. In 95 ROP patients without polycythemia, 86 cases (90. 53%) with ROP <3 stage and 9 cases (9. 47%) with ROP ≥3 stage were found. The difference of the incidence of ROP 0. 05). Conclusion Polycythemia may not affect the incidence of ROP, but impact on the severity of ROP. 相似文献