Beauty is not only in the eye of the beholder but also in the relationship of the eyes and mouth of the beholden. The distance between a woman’s eyes and the distance between her eyes and her mouth are key factors in determining how attractive she is to others, according to new psychology research from the University of California, San Diego and the University of Toronto. Female faces were judged more attractive when the vertical distance between their eyes and the mouth was approximately 36 percent of the face’s length, and the horizontal distance between their eyes was approximately 46 percent of the face’s width. The researchers suggest that the perception of facial attractiveness is a result of a cognitive averaging process by which people take in all the faces they see and average them to get an ideal width ratio and an ideal length ratio.

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