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Originally Posted by Greg Bryant
Well, back when Steve O'Meara first visually sighted Halley's comet through a 60cm (24 inch) telescope back in 1985 (the first person to do so since its previous return), he did so at high altitude (on Mauna Kea in Hawaii) while breathing bottled oxygen. At the time, Halley was about 19th magnitude.
Moral of the story - fresh air is better for you!
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How high is that peak? The retina tends to show effects of low oxygen before any other tissues, so vision is the first to drop off....
I have been in an altitude chamber at an altitude of just 15,000 feet breathing normal air.... we were being asked what we could see ahead..... it looked like a small red blur no matter how hard you strained.... when we took a couple of breaths of 100% oxygen you could immediately tell the red blur was 3 very large bright red illuminated instrument dials from an aircraft cockpit! No wonder pilots must breath supplemental oxygen over 10,000 feet! At 22,000 feet you can hardly think, let alone see!