an increase in the optic nerve diameter 5 or optic nerve sheath haemorrhage 6 that correlated with the anatomic features of an avulsed optic nerve head in the presence of overlying vitreous haemorrhage, as is frequently the case. These two cases amply demonstrate that ultrasonography is a helpful tool in the diagnosis of optic nerve avulsion obscured by overlying vitreous haemorrhage and a reasonably better alternative to expensive and less readily available neuroimaging studies.