Why at the optic chiasm, optic nerves have to cross to the other side of the opposite occipital cortex, what is the benefit of this “crossing feature”?

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Why at the optic chiasm, optic nerves have to cross to the other side of the opposite occipital cortex, what is the benefit of this “crossing feature”?

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Things don’t evolve for a reason, it’s completely random and it doesn’t matter if it’s beneficial as long as it doesn’t harm the organism.

Obviously if your random mutation helps you in some way that will increase the odds that you get to have kids and pass it on but even if it is completely useless that doesn’t mean you won’t have children anyway.

In humans, the left half of your brain gets nerve information from the left portion of both eyes. Likewise, the right half of your brain gets the right portion of both eyes.

It’s been suggested this allows the brain to compare any differences in the image halves better since we have an overlap in the field of vision of both eyes. This gives us our depth perception (stereo vision). Other theories also involve allowing us to have better hand eye coordination based on each half of our body and the two halves of our vision.

Animals without overlapping fields of view typically do not have a similar mixing of visual information from both eyes into the brain.