Fibrosis of Extraocular Muscles, Congenital, 3a, with or Without Extraocular Involvement, also known as congenital fibrosis of the extraocular muscles 3a, is related to moebius syndrome and strabismus. An important gene associated with Fibrosis of Extraocular Muscles, Congenital, 3a, with or Without Extraocular Involvement is TUBB3 (Tubulin Beta 3 Class III). Affiliated tissues include eye, and related phenotypes are agenesis of corpus callosum and specific learning disability