Oxygen? Really? And all these years Charlie Green has been telling me to breathe helium at the telescope. I thought his laughter reflected enthusiasm for my spoken observing reports while looking through the eyepiece. Now I'm not so sure. ;-) O'Meara is one of those lucky people who have eagle eyes normally. On O2, his vision must be akin to a CCD. You can also enhance your night vision by taking a beta carotene supplement earlier in the day, as well as wearing "night vision" goggles during the day. There's also that old story about WW2 pilots consuming bilberry jam, claiming that it improved night vision. On Sun, Apr 7, 2013 at 9:20 AM, <erikhansen@thebluezone.net> wrote:
O'mera relates that he uses O2 at altitude (above 10,000 feet), without getting into respiratory physiology once your blood has a certain Po2, adding oxygen has little effect and can be of some harm. A few liters per minute probably has little risk, although I think if it helps at low altitude you might need supplemental O2 all the time.