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The optic nerve fibers cross inside the optic chiasm sharing the same shell: The crossing fibers go ones between others, like on this classical picture -


According to an article in Vision Research Volume 50 issue 2 : "The face’s vertical distance between the eyes and the mouth is approximately 36% of its length, and the horizontal distance between the eyes is approximately 46% of the face’s width." The article can be found at: http://www.sciencedirect.com/science/article/pii/S0042698909005045

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