Blepharospasm. A neurotoxin can block the muscle action that is causing the blepharospasm.
Absolutely. Works like a charm. This is the first line therapy.
Yes. Botox was originally developed to treat blepharospasm as well as a host of other conditions that cause muscular spasms. My first experience with it many years ago was in treating facial spasms, this was long before we were using it for cosmetic purposes. I still use it for those reasons as well as for my cosmetic patients.
Can be. I believe that was one of the first conditions that Botox injections were used for.