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.

When they consume too much alcohol, marijuana, or cocaine, it makes the blood vessels of their eyes expand. This condition is known as bloodshot eyes, which is a common symptom of substance misuse.

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 ...

K-State's Technology Development Institute and College of Veterinary Medicine teamed up to create 3D-printed animal eye models for veterinary students to use when training for fundoscopy exams.