purpose: congenital third nerve palsy was generally thought to exist in isolation without associated abnormalities. in this report, we present a case of congenital third nerve palsy in osteogenesis imperfecta. methods: a 6-month-old girl with osteogenesis imperfceta presented with ptosis and large incomitant exotropia in left eye (le) at birth. ocular examination revealed total third nerve pals...