Scott, I've never heard of the term "convergence blepharospasm". Anybody else heard of it termed this way?
He may be referring to related blepharospasm symptoms or possibly meige.
There is a difference of opinion among physicians on whether Meige is an extension of BEB or a separate syndrome.
Meige may involve muscle spasms around the eyes, lower face, mouth, tongue, throat, neck and sometimes the respiratory system, any one of which may affect the voice. (taken from the blue booklet-Benign Essential Blepharospasm Meige and Other Related Disorders-20th Anniversary)
So, your doctor may just be referring to the "converging" of your related symptoms.
Most commonly there is Benign Essential Blepharospasm which is how it is usually termed and meaning that it isn't going to kill you and it is of unknown cause.
You can also have a reflex blepharospasm-which would be from an irritant of some kind or a dry eye condition which would clear when the condition was treated.
Another form of blepharospasm would be a "secondary blepharospasm" which might be related to an accident, truama or injury of some kind.
Someone else may have more to offer on this.
Shirley in rainy Arkansas
As each of us are individual, so too are physicians. Call him and ask him.