Someone's sclera:
Humans have a large amount of their sclera visible, partly because our iris are smaller then most animals and partly because it allows other humans to exchange non-verbal (i.e., to see where other peeps are looking)
Interestingly: "in the course of their domestication, dogs have also developed the ability to pick up visual cues from the eyes of humans, making them one of only two species known to seek visual cues from another individual's eyes... dogs do not seem to use this form of communication with one another and only look for visual information from the eyes of humans"
via http://en.wikipedia.org/wiki/Sclera
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