A 38-year-old man presented to the Eye Casualty department complaining of an episode of blurred vision affecting both eyes, particularly his left. The episode had occurred 4 weeks previously while climbing Mount Everest. It developed at an altitude of 6500 meters. The patient had at that point descended to base camp and received medical attention. He had no other complaints at that time. Specifically, he denied any lethargy, nausea, headache, confusion or breathing disturbance. His vision remained blurred, but he was permitted to continue his ascent to 7100 meters. He was referred to our department upon return from Kathmandu.
There was no significant past medical history; specifically, there was no history of diabetes or hypertension.
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