Optic nerve hypoplasia: clinical and ultrasonographic study.

The ocular and systemic features of 11 cases of optic nerve hypoplasia were analysed, with particular reference to visual function and associated anomalies of the central nervous system. Schizencephaly, noted in one of the cases, is reported for the first time in association with optic nerve hypoplasia. The role of ultrasonography in the diagnosis and qualitative evaluation of optic nerve hypoplasia is highlighted.