瞳孔开大; 瞳孔扩大
Mydriasis \My*dri"a*sis\, n. [L., fr. Gr. ?.] (Physiol. & Med.) A long-continued or excessive dilatation of the pupil of the eye.
mydriasis n : reflex pupillary dilation as a muscle pulls the iris outward; occurs in response to a decrease in light or certain drugs