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A 52-year-old man with no previous medical history, but a high body mass index (BMI) >34, presented with a sudden onset of a painful, apparently proptosed left eye and decreased left vision (see figure 1 ). He had rubbed his eye on waking. On examination, there was no relative afferent pupillary defect. Snellen chart testing was 6/12 (pinhole 6/6) ocular sinistra (OS) and 6/6...





