system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What stops our eyes from moving independently from each other?

Edit: Also, why does it stop them? Is there a downside to independent eye movement or something?
gpt
Our brain usually doesn't let them. That said, they often do. Certain drugs, concussions, disorders, and such can allow them to. Also, some people can force them to move independently just with their minds.