Visual Sensitivities under Reduced Oxygen

摘要

Thirteen subjects were confined in a hypobaric chamber for 15 days, and their scotopic sensitivity and field-of-view were measured twice a day. The oxygen concentration in the nitrogen-oxygen atmosphere was changed every three days in this sequence: 21%, 17%, 21%, 13%, and 21%. The barometric pressure was always equivalent to sea-level, except for the final 7 hours of exposure to 17% oxygen when it was reduced to 576 torr. The atmosphere was contaminated with 0.9% carbon-dioxide throughout the confinement. Neither visual function was degraded by the lowered oxygen levels.