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I think some care is in order in attributing visual disturbance 
symptoms to oxygen toxicity, especially when working hard.  Many 
years ago I experienced visual disturbances (inability to focus) 
while breathing air at a little less than one atmosphere.  At the 
time I was trying to carry a pack too heavy for me part way up 
Mt. Washington, New Hampshire.  The symptoms disappeared after I 
had rested for a few minutes.  Looking back I imagine that the 
difficulty was either Co2 buildup or anoxia.  At the time I had 
been exercising regularly and was in quite good shape.

Bruce Gerhard
bruceg@wo*.st*.co*

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