Why does crossing your eyes blur your vision?
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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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