Noun
A long-continued or excessive dilatation of the pupil of the eye.
Source: Webster's dictionaryDamage to the oculomotor nerve (III) can cause double vision ( diplopia ) and inability to coordinate the movements of both eyes ( strabismus ), also eyelid drooping ( ptosis ) and pupil dilation ( mydriasis ). Source: Internet
Dilated pupils ( mydriasis ) are prominent during khat consumption, reflecting the sympathomimetic effects of the drug, which are also reflected in increased heart rate and blood pressure. Source: Internet