The total astigmatism was well correlated with cornea astigmatism.
角膜 散光与总和散光呈显著正相关；
When the cornea curves or flattens unevenly, the result is astigmatism, which disrupts focus of near and distant vision.
散光是当角膜变弯或者变平时表面不平坦，影响视近、视远时的聚焦。
Astigmatism: distorted vision resulting from an irregularly curved cornea, the clear covering of the eyeball.
散光：因角膜(覆盖眼球的一层透明膜)不规则弯曲而引起的影象变形。
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