白内障人群的角膜散光分布

The distribution of corneal astigmatism in the patients with cataract

目的:研究白内障人群角膜散光分布规律。方法:分析980例(1010眼)白内障患者的角膜地形图。结果:(1)散光度数的大小与年龄呈正相关(r=0.092,P=0.003),随着年龄的增长,散光度数有增大的趋势;而散光度数的大小与性别及左右眼之间没有相关性(P>0.05);(2)24.8%的白内障患者术前角膜散光<0.50D,而>1.00D的有41.8%;(3)随着年龄的增长,顺规散光所占比例越来越小(由41～50岁的66.7%减少为>90岁的22.2%),而逆规散光所占比例越来越大(由20.0%～66.7%),而对于斜向散光,则没有很明确的趋势。结论:随着年龄增长,散光度数有增大的趋势;大约40%的白内障患者可能需要矫正散光;随着年龄增长,顺规散光逐渐向逆规散光漂移。

AIM ： To study the distribution of corneal astigmatism in the patients with cataract. METHODS. A retrospective analysis was performed of 980 cataract patients （1 010 eyes） without having been suffered injury or performed operation. The degree and the axis of astigmatism were analyzed using the corneal topography. RESULTS： Significant correlations were found between the degree of corneal astigmatism and the age（ r = 0. 092, P= 0. 003）, the older they are, the bigger the degree of astigmatism is. There was no significant correlation between the gender and the degree of astigmatism （ P 〉 0. 05）,and there was no difference between the right eye and the left eye. 24.8% eyes of these patients have less than 0.50D of astigmatism, and exactly 41.8% are more than 1.00D. And the percentage of astigmatism with the rule decreased with the age（from the group of 41 - 50 years old with 66.7% to the older than 90 with 22.2% ）, but increased for astigmatism against the rule（ from 20.0% to 66.7% ） . And there was no trend for oblique astigmatism. CONCLUSION. In the patients with cataract, the degree of astigmatism increased with the age and more than 40% eyes of them need correct their astigmatism. And the pattern of corneal astigmatism shifts from with-the-rule to aginst-the-rule astigmatism.