Another reason for me not to go up there: 
  
Dangers at Altitude 
  
* Retinal haemorrhages – bleeding from the cells at the back of the eye – are a relatively common complaint of mountain climbers. High altitude causes the blood to thicken, increasing blood pressure, which can lead to the seepage of blood from cells into surrounding tissues. 
  
* Some researchers have found that more than a quarter of climbers on an Everest expedition are affected by retinal haemorrhages. Normally, they are minor, with no noticeable effect on vision, and resolve themselves within weeks of a return to low altitudes. But in Peter Kinloch's case it appears the effects were acute and extreme, causing total loss of vision, which led to deadly consequences.