The theory is that a white sclera surrounding a darker iris and pupil helps people work out where everyone else is looking.
该理论认为，围绕在深色虹膜和瞳孔周围的白色巩膜帮助人们判断出其他人在看哪里。
Humans also happen to have scleras-the white part of the eye surrounding the iris-that are much bigger and brighter than the scleras of other primates.
与其他灵长类动物相比，人类在虹膜周围恰恰拥有更大，更明亮的白色巩膜。
Note: A Crested Serpent Eagle has a yellow lore, yellow iris and a white bar on primaries and tail.
注：蛇雕的眼先及虹膜为黄色，飞羽及尾羽近末端各有一条白色宽横带。
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