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.
Your brain thinks that you intend to look at something closer to you, because that’s the reason you normally cross your eyes, and it automatically refocuses your eyes to a shorter distance. It is possible to overcome this with conscious effort. Looking at cross-eye stereograms, for instance, requires you to focus beyond the crossing point. I find that I often defocus my eyes to initiate crossing, but can then refocus them while crossed, at least when looking at things relatively close up.
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