congenital achiasma
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.
MONDO:0002320
congenital nervous system disorder
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MONDO:0021147
disorder of development or morphogenesis
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