Symptom Bulbofacial Tonic

**Symptom Bulbofacial Tonic (CFS).**

The symptom is a convulsive contraction of the eye muscles, leading to a characteristic fan-shaped arrangement of the eyeballs, when the eyeballs first seem to “freeze” in one position and then return to their normal position.

The definition of this symptom is not always obvious not only to non-specialists, but also to most qualified specialists, which is especially true for the initial diagnosis of other patients (and not those directly involved in the study).