Description : Blepharospasm is a primary focal dystonia affecting the orbicularis oculi muscles,
usually beginning in middle age. Initial symptoms include eye irritation and frequent
blinking, progressing to involuntary spasms of eyelid closure. In severe cases, this
can lead to functional blindness (summary by Misbahuddin et al., 2002).;
Inheritance : Autosomal dominant;
Molecular basis : Susceptibility conferred by allele 2 of the dinucleotide repeat in the dopamine receptor
gene (DRD5, 126453.0001);