Pupillary response

Pupillary response

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Pupillary response

Pupillary response or dilation of the pupil is a physiological response that varies the size of the pupil of the eye via the iris dilator muscle. It can have a variety of causes. It may be an involuntary reflex reaction to exposure to light. Or it may indicate interest in the subject of attention or indicate sexual stimulation.^[1] The pupils contract immediately before someone falls asleep.^[2]

A pupillary response can be intentionally conditioned as a Pavlovian response to some stimulus.^[3]

The latency of pupillary response (the time in which it takes to occur) increases with age.^[4]

In ophthalmology, intensive studies of pupillary response are conducted via videopupillometry.^[5]