reflex pupillary dilation as a muscle pulls the iris outward; occurs in response to a decrease in light or certain drugs
mydriasis详细解释
my.dri.a.sis n.（名词）Prolonged, abnormal dilatation of the pupil of the eye caused by disease or a drug.瞳孔扩散：由于疾病或者药物引起的眼睛瞳孔变长、不正常的扩大 来源：Latin 拉丁语 from Greek mudriasis 源自 希腊语 mudriasis
