Your brainstem is the most basic area of the brain. The area of the brain that we have in common with almost all other levels of the animal kingdom. It extends right into the spinal cord. A lot of other whole body involuntary reflexes come from the spinal cord - that's another story for another day).
Other eye focusing problems are not rooted in the midbrain. They are more likely rooted in the areas of the brain that control orbital muscles or in the areas that translate what your eyes are seeing, like a "lazy eye" or drifting eye or being cross-eyed. There are therapies that doctors prescribe to try and strengthen the weak eye. Blinking is usually a response to eye moisture.
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Music Credits: “Radio Martini” Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 3.0 http://creativecommons.org/licenses/by/3.0/