When the pupils don't dilate or constrict properly, it indicates the onset of a vision problem. Substance misuse can also interfere with our eyes' response to nervous stimulation.

Small, constricted pupils can be a side effect of opioid use. Learn about other signs to watch for and how to bring up your concerns in a helpful, compassionate way.

A head or eye injury can cause constricted pupils and should be immediately assessed and treated. Head trauma or a stroke are medical emergencies that can be life-threatening.

Opioids usually make a person’s pupils constrict. This is when the black part at the center of the eye gets smaller, reducing the amount of light that gets inside. Typically, pupil constriction ...

Overview Miosis means excessive constriction (shrinking) of your pupil. In miosis, the diameter of the pupil is less than 2 millimeters (mm), or just over 1/16th of an inch.

A study has found that people appear more attractive when their pupils are constricted, making their coloured irises seem bigger and brighter. New research by Zachary Estes, Professor of Marketing ...