Sun exposure is an environmental factor for the development of blepharospasm.


BACKGROUND Adult-onset isolated focal dystonia may present with various phenotypes including blepharospasm and cervical dystonia. Although inherited in an autosomal dominant manner with a markedly reduced penetrance, environmental factors are considered important in disease penetrance and expression. We observed a marked variation by latitude in the reports… (More)
DOI: 10.1136/jnnp-2014-310266