老年性白内障患者中角膜后表面散光对总角膜散光的影响

发布时间：2018-01-03 17:22

本文关键词：老年性白内障患者中角膜后表面散光对总角膜散光的影响　出处：《眼科新进展》2015年07期 　论文类型：期刊论文

【摘要】：目的研究老年性白内障患者模拟角膜曲率计散光和总角膜散光大小及轴位的差异,评价角膜后表面散光对总角膜散光的影响。方法 80例老年性白内障患者(105眼,左47眼,右58眼)手术前行Pentacam检查,记录角膜前后表面散光,并对角膜前后表面散光行相关性分析。模拟角膜曲率计散光用屈光指数1.337 5及角膜前表面曲率半径计算,总角膜散光由前→后表面散光在角膜后表面的矢量合计,计算模拟角膜曲率计散光和总角膜散光的矢量差E、大小差E和轴位差A。结果角膜前表面散光和后表面散光大小间无明显相关性(P=0.98),后表面散光对前表面散光的平均补偿作用为5.79%。总角膜散光及模拟角膜曲率计散光大小分别为(1.12±0.65)D和(1.07±0.64)D,差异具有统计学意义(t=-2.40,P=0.02);两者轴位分别为(67.93±56.50)°和(68.90±59.68)°,差异无统计学意义(t=-0.27,P=0.79)。散光值大小及轴位差异的算术均值分别是(0.05±0.23)D和(-0.57±13.02)°,绝对值是(0.19±0.15)D和(7.00±10.97)°。两者散光大小差别大于0.50 D或轴位差别大于10°的有30眼,占28.57%。结论老年性白内障患者忽略角膜后表面测量可能会导致具有临床意义的角膜散光值估计的差异。
[Abstract]:Objective to study the difference of astigmatism and axial position between simulated keratometer and total corneal astigmatism in senile cataract patients. Methods Pentacam was performed in 105 eyes, 47 eyes and 58 eyes of 80 patients with senile cataract before operation to evaluate the effect of posterior corneal astigmatism on total corneal astigmatism. The astigmatism of the anterior and posterior corneal surface was recorded, and the correlation between the corneal astigmatism and the anterior surface astigmatism was analyzed. The refractive index of 1.337 5 and the radius of the anterior surface of the cornea were used to simulate the astigmatism of the cornea. The total corneal astigmatism was calculated from the anterior surface. 鈫扵he vector difference between simulated keratometer astigmatism and total corneal astigmatism was calculated. Results there was no significant correlation between the size of the anterior surface astigmatism and the posterior surface astigmatism. The average compensation effect of posterior surface astigmatism on anterior surface astigmatism was 5.79. The astigmatism of total corneal astigmatism and simulated keratometer were 1.12 卤0.65 and 1.07 卤0.64, respectively. D. The difference was statistically significant. The axial position of the two groups were 67.93 卤56.50 掳and 68.90 卤59.68 掳, respectively. There was no significant difference between them. The arithmetic mean values of astigmatism and axial difference were 0.05 卤0.23D and -0.57 卤13.02 掳, respectively. The absolute values were 0.19 卤0.15 D and 7.00 卤10.97 掳respectively. There were 30 eyes whose astigmatism difference was greater than 0.50D or axial difference was more than 10 掳. Conclusion neglecting the posterior corneal surface measurement in senile cataract patients may lead to the difference of corneal astigmatism estimation of clinical significance.
【作者单位】：天津医科大学眼科医院;
【分类号】：R776.1
【正文快照】： 在白内障屈光手术时代,如何取得良好的术后成,然而传统角膜曲率计忽略了PA。由于PA曾经裸眼视力,降低对框架眼镜的依赖是临床眼科医师很难测量,所以角膜曲率计用屈光指数1.337 5及角的研究热点。其中角膜散光的准确矫正,是决定白膜前表面半径来粗略估计总角膜散光(total corne

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