Hi. I'm online and happy to answer your question today.
Yes, you are correct. The third cranial nerve controls the movement of the majority of the muscles that move the eyeball. This nerve also runs the muscles that raises the upper eyelid as well as controls the pupil movement. It sounds like your son damaged the third cranial nerve as it enters the orbit behind the eyeball. I am glad that his vision is otherwise unaffected.
There is, unfortunately, nothing that can be done at this point other then wait and see if function returns to the nerve.
Does this make sense to you?
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what percentage would you guess that the nerve would work again