Horner Syndrome

Horner syndrome, also known as oculosympathetic palsy or Bernard-Horner syndrome, is a relatively rare neurological syndrome that affects your eye and the surrounding tissues on one side of your face.

It occurs due to a disruption of the pathway of the sympathetic nerves that connect your brainstem to your eyes and face. These nerves control involuntary functions, such as sweating (perspiration) and the dilation and constriction of the pupils of your eyes.

Is Horner syndrome life-threatening?

The symptoms associated with Horner syndrome generally don’t cause significant issues with your health or vision. However, they can indicate the presence of an underlying health problem that may be very serious. It’s important to seek medical care if you develop symptoms of Horner syndrome to determine the underlying cause.

Who does Horner syndrome affect?

Horner syndrome can affect anyone at any age. About 5% of people with the condition have the congenital form (present from birth).

How common is Horner syndrome?

Horner syndrome is uncommon. It affects approximately 1 in 6,000 people.