congenital nervous system disorder congenital achiasma https://github.com/monarch-initiative/mondo/issues/4069 https://github.com/monarch-initiative/mondo/issues/6876 https://www.malacards.org/card/congenital_achiasma Orphanet:324353 Congenital achiasma is a rare, genetic, non-syndromic cranial nerve and nuclear aplasia malformation characterized by the congenital absence of the optic chiasm, resulting from the failure of the optic nerve fibers to cross over and decussate to the contralateral hemisphere, leading to decreased vision, strabismus and congenital nystagmus in infancy. MEDGEN:1392790 MONDO:0017929 GARD:0021438 SCTID:734031008 UMLS:C4518345 disorder of development or morphogenesis