Pupil constriction - PsychonautWiki
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An image example of pupil constriction.

Pupil constriction (also called pinpoint pupils or miosis) can be described as the reduction of the size of a person's pupils under normal lighting conditions. This typically decreases a person's ability to see in low light conditions.

Pupil constriction is most commonly induced under the influence of moderate dosages of opioid compounds, such as heroin, kratom, tramadol, and fentanyl.

Psychoactive substances

See also

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