Why does crossing your eyes blur your vision?
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The brain knows how to connect the two images from the two eyes to add depth information to the image we are seeing. To do this we need to be looking at the same object by two different points. It does not work when looking at two different things, like it happens when we cross our eyes. When presented with two different images, our brain just creates a blurry mess.
Note. If a cross eyed baby is not adequately treated, their brain learns to favor a single eye and that can become permanent.
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