Medically reviewed by Christine L. Larsen, MD Medications, trauma, and medical conditions can lead to abnormally small pupils (miosis). In miosis, the pupil is smaller than it should be, even in ...

Constricted or dilated pupils can be an important clue to help your doctor diagnose your condition. Causes of miosis. The size of your pupil is controlled by two counteracting muscles — the iris ...

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.

Pinpoint pupils are pupils that remain very small, even in bright light. They can signify many issues, including drug use, poisoning, or a hemorrhage.

Constricted pupils, on the other hand, tend to be perceived as a sign of threat -- thus, the researchers did not expect that mimicry of constricted pupils would be associated with trust.

Remarkably, their pupils constricted or dilated as if they had been staring at the actual shapes. Laeng and Sulutvedt saw the same pattern when they asked subjects to imagine more complex scenes ...

Our pupils’ fast response to light appears to occur even without input from the brain. For example, it is seen in people with damage to the visual cortex. Appearances can be deceptive, though.

You have more control over your body than you might think. Take your pupils. The small black dots are our window on the ever-changing world. As light waxes and wanes, our pupils contract and dilate.