散光的病因。

Am J Optom Physiol Opt. 1978 Mar;55(3):214-8. doi: 10.1097/00006324-197803000-00012.

A large amount of evidence suggests that astigmatism is hereditary. Other evidence indicates that the prevalence of astigmatism varies widely between and within racial groups and that both the direction and the amount of astigmatism tend to vary as a function of age and in response to environmental influences.

大量证据表明散光具有遗传性。其他证据则显示，散光的患病率在不同种族群体之间以及同一种族群体内部差异很大，而且散光的方向和程度往往会随着年龄的增长以及对环境影响的反应而有所变化。