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目的:以不同年龄段分组评估前角膜散光(ACA)和后角膜散光(PCA)。同时分析各年龄段ACA、PCA之间散光程度、散光轴的相关性。方法:横断面研究,包括381眼。将临床测得的散光数值转换为向量记法,以分析ACA和PCA。在整体人群和四个不同年龄段(5~19,20~39,40~59,和≥60)中评估ACA和PCA之间散光程度、散光轴的关系。使用随机效应线性回归模型评估ACA、PCA散光程度之间的关系。结果:在5~9岁儿童中,ACA平均散光度最高为3.59D,PCA为0.50D。总体上来说,ACA在1~10.0D,PCA在0~3.5D。在较年轻的分组中(5~19岁),ACA和PCA显著相关(r=0.85,P<0.001)。在60岁以上组中,ACA每增加1D,PCA增加0.04D(95%CI:0.005,0.07;P=0.03),增加程度相比其余组最少。结论:在60岁以上人群中,相比仅仅依靠经验公式,通过ACA数据计算IOL度数,更为谨慎的方法是同时测定后角膜散光度和散光轴。
OBJECTIVE: To assess anterior corneal astigmatism (ACA) and posterior corneal astigmatism (PCA) in different age groups. At the same time, the correlation between astigmatism and astigmatism axis between ACA and PCA in all ages was analyzed. Methods: Cross-sectional study, including 381 eyes. The clinically measured astigmatism values were converted to vector notation to analyze ACA and PCA. The astigmatism and astigmatic axis relationships between ACA and PCA were assessed in the overall population and four different age groups (5-19, 20-39, 40-59, and ≥60). A randomized linear regression model was used to assess the relationship between ACA and PCA astigmatism. Results: In children aged 5 to 9 years, the average astigmatism of ACA was 3.59D and PCA was 0.50D. Overall, ACA is between 1 and 10.0 D and PCA is between 0 and 3.5 D. In the younger cohorts (ages 5-19), ACA was significantly associated with PCA (r = 0.85, P <0.001). In the 60-year-old group, PCA increased by 0.04D for every 1D increase in ACA (95% CI: 0.005,0.07; P = 0.03), with the least increase compared with the other groups. CONCLUSIONS: In the population over the age of 60, it is more cautious to measure posterior corneal astigmatism and astigmatism than to rely solely on empirical formulas to calculate IOL power using ACA data.