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In reply to Jasons report of tunnel vision

>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.

I agree that care must be taken, particularly in light of the the occurance 
of visual disturbance at a relatively trivial PO2 of 0.84bar and the fact 
that he reported hard work with poor breathing equipment, his tacit 
acknowledgement of CO2 buildup.  Jason indicated his doubts and described 
this as probable O2 toxicity.  Nevertheless, there is good evidence of 
progressive tunnel vision as a symptom CNS O2 toxicity. 

regards,

David Doolette
ddoolett@me*.ad*.ed*.au*

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