表 1. Distribution of astigmatism severity among 255 959 children aged 3 to 14 years.

3~14岁255 959名儿童散光程度分布

Astigmatism	RA/%	CA/%
RA: refractive astigmatism; CA: corneal astigmatism.
0 D	12.95	0.02
－1.00-< 0 D	75.57	38.31
－2.00-< －1.00 D	8.59	51.97
－3.00-< －2.00 D	2.07	8.00
－4.00-< －3.00 D	0.58	1.37
< －4.00 D	0.24	0.32