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。
The theory is that a white sclera surrounding a darker iris and pupil helps people work out where everyone else is looking.
LASIK 眼科手术改变了你的角膜的形状——角膜是覆盖在你的瞳孔和你的眼睛的有色部分（虹膜）上的弧形透明膜。
LASIK eye surgery changes the shape of your cornea—the transparent membrane that arcs over your pupil and the colored part of your eye (iris).
殡葬员说染料对他的眼球起了种奇怪的作用，把它们彻底变白了，彻底到连虹膜的褐色和瞳孔的黑色都被漂白了。
The undertaker said that the dye had done a strange thing to his eyeballs, turned them white and completely so, so that the brown of his irises and the black of his pupils had been leached away.
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