Mydriasis

Definition

Mydriasis is the dilation or widening of the pupils, which can occur due to exposure to certain drugs, diseases, or trauma. It is a response that can either be part of normal physiology or indicate an underlying condition when it occurs abnormally.

Related terms

Autonomic Nervous System:

The part of the nervous system that controls involuntary actions, such as heart rate, digestion, and pupil dilation.

Parasympathetic Nervous System:

A division of the autonomic nervous system responsible for rest and digest functions, typically constricting the pupils.

Sympathomimetic Drugs: Drugs that mimic or enhance the actions of the sympathetic nervous system, often causing effects such as increased heart rate and pupil dilation (mydriasis)