屈光不正是指平行光线通过眼屈光间质不能在视网膜上成像。它包括近视、远视和散光。屈光不正引起头痛的原因:远视和散光最容易引起屈光不正性头痛。远视眼看远方目标时需要睫状肌的收缩调节,看近物时更要用比正常人大的调节力,才能使视网膜成像焦点前移,获得比较清晰的物像。有些病人长期从事近距离作业,如阅读、书写、缝纫、 Refractive error refers to the parallel light through the eye refraction can not be in the retina imaging. It includes myopia, hyperopia and astigmatism. Reasons for headaches caused by refractive errors: hyperopia and astigmatism most likely to cause anisometropia headache. Hyperopia to see the distance when the target needs ciliary muscle contraction adjustment, look closer to more use than the normal regulation of large adjustment in order to shift the focus of retinal imaging, to obtain a more clear image. Some patients have long been engaged in close work, such as reading, writing, sewing,