Horner Syndrome is a disorder of the sympathetic nervous system that affects the eye, face and neck. It is characterized by a combination of symptoms that include a drooping eyelid, a small pupil, and a lack of sweating on one side of the face. It can be caused by a variety of underlying conditions such as a tumor, injury, or disease.

Symptoms of Horner Syndrome include a drooping eyelid, a small pupil, and a lack of sweating on one side of the face, along with the absence of wrinkles on the forehead. Other symptoms can include redness of the eye, dryness of the eye, and sensitivity to light.

Diagnosis of Horner Syndrome typically begins with a physical examination and a neurological examination to evaluate the pupil, eyelid, and sweating. Additional tests such as a CT scan or MRI may be performed to identify the underlying cause of the condition.

Treatment of Horner Syndrome depends on the underlying cause of the condition. In some cases, no treatment may be necessary, while in others, treatment may include medications, such as epinephrine, to dilate the pupil, or surgery to remove a tumor or repair an injury.

Preventing Horner Syndrome is not possible as it is a disorder caused by various underlying conditions. However, early diagnosis and appropriate treatment can help to prevent serious complications and improve quality of life.