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Several studies reported inconclusive results on the intluence of altitude hypoxia on color vision, More analytical studies were needed to confrm lhe relationship, since color vision is one ofthe important vision paramelers contrtbufing to the pilots'human errorfactors. This experiment aimed to prove the causal relationship between altitude hypoxia at 18,000 feet and color vision changes. A randomized clinical trial using Ishihara book was used to test color vision in the study and control groups. The study and control group wcts selected randomly among 98 civilian pilot candidates aged 17-23 years. The study group was exposed to oltitude hypoxio at 18,000feet. The Ishihara test was performed at ground level and at 18,000feet (simulated in a low pressure chamber) afer 6-8 minutes, when 72-6494 of02 saturated blood level was achieved. Results showed that at early hypoxic condition, an increase in total reading time and a decrease in the percentage olplates reading right was identiJied. The diference was signifcant bètween the two grouPs. This study concluded that altitude hypoxia caused minor changes in color vision at early hypoxic state, which were still in the normal range.

Color vision response to hypoxia at a simulated altitude of 18,000 feet