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ChristianKl comments on Open Thread May 9 - May 15 2016 - Less Wrong Discussion
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I can't quickly find a source for each hemisphere receiving only a part of the visual field, but the optical nerves coming from each eye cross before reaching the brain, so it's not "one eye, one hemisphere". (That doesn't mean "the left one goes right and vice versa", but "they join, and then they split again".)
https://en.wikipedia.org/wiki/Optic_nerve
The nerves cross in the ChangingMind descriptions. That's how the left eye surplies the right hemisphere and vice versa. I don't see how they join in the sense of sharing information while the cross.