Presenting History: A twenty nine year old healthy Caucasian female, 8 weeks post-partum, presented with loss of the upper half of visual field in the right eye. The patient noticed blurry vision OD on waking up early in the morning associated with photopsia, lasting 30 minutes which resulted a superior visual field defect. She did not report any improvement in her symptoms when she was seen in the clinic about 9 hours later. Past Ocular History: none Past Medical History: Admission in hospital at age of 22 years with severe chest pain which was treated initially as pulmonary embolism. She underwent investigations which did not prove the diagnosis though and the treatment was stopped in a day. No conclusive diagnosis was given for her symptoms. Past Obstetric History: 3 gravida, 3 para. All the pregnancies were uncomplicated. Social History: Non-smoker, 2 pints of alcohol a day.