It's at least somewhat like that with humans too. Ever wondered why some kids are wearing a patch over one eye? If the child needs glasses but (in particular) when they didn't get proper correction early on then they may have double vision, and what the brain does is to block one eye. That eye, despite "seeing", will lose the paths in the brain necessary for seeing well. The patch forces the brain to start using the eye again.
This happened to me - the doctor told my father "no need to check this regularly", and after some years one of my eyes had indeed lost resolution. It's still like that. One eye can see very well, the other at much lower resolution. Though I found that even at middle age it was possible to improve that to some extent - not the actual resolution, but the brain's ability to actively use the eye could be improved a little. I would read books with only one eye. Could only read half a page at the beginning. But it's impossible to recover the vision I lost as a child, which was caused by the brain ignoring the eye.
But yes, the binocular vision is permanently shot (though I get some improvement at times).
That's what you get for being an insufferably stubborn kid.
The annoying part is that my "untrained" eye is not near-sighted, but my "trained" eye is. I suspect it was different in the childhood (untrained: far-sighted, trained: not far-sighted) and then shifted in the direction of near-sightedness over time.