Red, Yellow, and Super-White Sclera

摘要: The sclera, the eye's tough outer layer, is, among primates, white only in humans, providing ground necessary for display of colors that vary health and disease. current study evaluates scleral color as a cue socially significant information about health, attractiveness, age by contrasting perception eyes with normal whites copies those whose were reddened, yellowed, or further whitened digital editing. Individuals red yellow sclera rated to be less healthy, attractive, older than individuals untinted control sclera. whitened, "super-white" younger, although not more healthy controls. In clear, may join such traits smooth skin long, lustrous hair signs beauty, reproductive fitness. evolution have contributed emergence humans social species.