不同海拔高度对视觉机能的影响

人在不同海拔高度(4000米以下),对红、绿色能正确辨认;对黄、白色在海拔3980米时出现错辨;对蓝色则从海拔2640米以上开始产生错辨,尤其在距离120米处错辨率达72.7%,在海拔3980米距离为120米处错辨率达78.8％.结果表明:视觉机能减弱不仅与高原低氧而且与疲劳因素有关.

Effects of Different Elevations upon Visual Functions

Red and green color can be correctly distinguished by human sight at different altitudes within 4,000 metres above sea-level; yellow and white color can't be distinguished at an altitude higher than 3,980 metres above sea-level: blue color can't be distinguished above an elevation of 2,640 metres, the rate of incorrect discrimination at a distance of 120 metres being 72.7 percent at this elevation and 78.8 percent at an altitude of 3,980 metres above sea level. The study shows that the decrease in visual functions is related not only with hypoxia in high mountions but also with tiredness.