Another health hazard is retinal haemorrhages, which can damage eyesight and cause blindness.
2.
Mild to moderate anaemia, hypoproteinaemia, mild to moderate renal azotemia, retinal haemorrhages, and glaucoma are common manifestations.
3.
Up to a quarter of Everest climbers can experience retinal haemorrhages, and although they usually heal within weeks of returning to lower altitudes, in one case a climber went blind and ended up dying in the death zone.
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