_:vb50942015 . _:vb50942015 . _:vb50942015 . _:vb50942015 . _:vb50942015 "url:https://pubmed.ncbi.nlm.nih.gov/18214786/"^^ . _:vb50942015 "A congenital fibrosis of the extraocular muscles that is characterized by a variable phenotype where individuals may not have bilateral involvement, may be able to raise the eyes above midline, or may not have blepharoptosis and that has_material_basis_in heterozygous mutation in the TUBB3 gene on chromosome 16q24."^^ .