When comparing the eye shapes of various animals, the human eye has three distinctive features: the sclera* is white, the area of the sclera is large, and the eyes are horizontally flat.
These characteristics are thought to make it easier for humans to convey their gaze to others, and enhance their ability to communicate—for example, to convey their intentions.
■References (Books, papers, Web articles, etc.)
『「サル化」する人間社会』 第6章 言語以前のコミュニケーションと社会性の進化 山極寿一 （集英社、2014）
Kobayashi H., Koshima S. 1997. Unique morphology of the human eye. Nature. 387(6635):767-768.
「見る／見られる／見せる目～コミュニケーションにおいて白目が果たす機能」小林洋美（武田薬報web） URL: https://takeda-kenko.jp/yakuhou/feature/role/vol01.html
*The sclera is the part of the eye other than the pupil and iris. In humans it is wide and white, but in many primates it is colored and narrow, making it difficult to detect their gaze or eye movements
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