[Double vision as a symptom of a serious disorder].

Three women, aged 54, 69 and 73 years, respectively, developed diplopia together with ptosis of an upper eyelid during light exercise or fatigue or continuous; in one patient the diplopia was followed by headache and vomiting. The diagnoses made were 'intracranial aneurysm', 'myasthenia gravis' and 'temporal arteritis'. Diplopia may be a symptom of a disorder timely diagnosis and treatment of which may prevent serious consequences.