Sudden onset of pain in the eye and blurring of vision

A 64 year old man was admitted with sudden onset of pain in his right eye, blurred vision, and double vision on looking to the right. His medical history included hypertension, myocardial infarction, and a stroke from which there was no residual deficit. Neurological examination identified intention tremor in both arms, horizontal nystagmus, and diplopia on looking to the right. He had no motor weakness, but the left plantar was extended. Examination of his face provided clues to the diagnosis (figure⇓). ### Short answers: ### Long answer 1: Likely diagnosis The figure shows a unilateral partial ptosis, miosis and apparent enophthalmos. Causes of unilateral ptosis include lesions of the third cranial …