Review Symptom

Revillot's sign, also known as split eye squinting, is a neurological symptom described by Swiss physician Louis Revillot in 1885.

The essence of the symptom is that when the facial nerve is damaged, the patient cannot completely close one eye, while the other eye closes normally. This occurs due to paralysis or paresis of the muscles around the eye on the affected side.

Causes:

1. Facial nerve paralysis/paresis (for example, due to facial neuritis or tumor in the cerebellopontine region)
2. Stroke in the brainstem
3. Facial nerve injury
4. Tumor of the facial nerve or parotid gland

Diagnosis of the Revillo sign helps to localize the lesion and determine its cause. This is an important neurological symptom that should be considered when evaluating patients with suspected facial nerve or brainstem pathology.