What is anisocoria?

What is anisocoria?

Anisocoria is the medical term for when one of your pupils is bigger than the other.

The pupil is the black center of your eyes that expands and contracts to help you see in different amounts of light. It naturally changes size without you noticing or controlling it. It shrinks (contracts) in bright light and expands (dilates) in dim light.

Visit your provider or go to the emergency room if you notice one of your pupils is suddenly larger than the other. Some people develop anisocoria with no long-term complications, but it can also be a sign of a much more dangerous issue in your body.