Disorders of ocular motility.

Disorders of ocular motility usually present with double vision which may be accompanied by ptosis and pupillary changes. The differential diagnosis comprises supranuclear, nuclear and infranuclear palsies and diseases of the myoneural junction. Accurate assessment is important, since the aetiological possibilities include neurosurgical emergencies such as intracranial aneurysm and systemic problems such as diabetes mellitus.