While vision occurs in the occipital lobe of the brain, coordinating eye movements and maintaining fusion occurs in the midbrain (the pons) and is “involuntary.” That is, unless your name is Marty Feldman, your brain is always working to keep both eyes focused on the same object at all times. It’s a complicated process, much of which I have forgotten the details of since I took neurology in Optometry school.
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