The goal of our study was to evaluate colour vision during high-altitude mountain climbing without supplemental oxygen. Two Himalayan expeditions were invited to test their colour perception at both the highest possible altitude and on the largest possible number of subjects. The panel desaturated D15 was used, because only a simple test could be transported to those altitudes. There were 2 evaluations (i.e., 4 eyes) at 7,000 m during the first expedition in 1997, and 3 evaluations (i.e., 6 eyes) at 6,500 m during the second expedition in 1998. The results were in perfect agreement and can be considered practically normal for all 5 mountain climbers.

中文翻译：

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高海拔地区的色觉。

我们研究的目的是评估没有补充氧气的高海拔登山过程中的色觉。邀请了两个喜马拉雅探险队在可能的最高海拔和最多的受试者人数上测试他们的色彩感知。使用了饱和度为D15的面板，因为只能将一个简单的测试运送到这些高度。在1997年的第一次探险中，有7,000 m处有2个评估（即4眼），在1998年的第二次探险期间有6个500 m处有3个评估（即6眼）。结果完全吻合，可以实际考虑所有5个登山者都正常。