Medically, it is used by to treat spasticity and 'blepharospasm' .

The mix-up happened when the five were being treated at Bradford Royal Infirmary for an eye condition called 'blepharospasm' , which causes involuntary muscle contractions that cause the eyelids to close.

A tic commonly affecting adults is a spasmodic closure of one or both eyes, known as 'blepharospasm' .

Mrs Dunne was being treated for 'blepharospasm' , a condition which causes twitching of the facial muscles.

Bulging of the cheeks, chewing movements, blinking, 'blepharospasm' , grimacing, and arching of the eyebrows also occur.