system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why can't human eyes slowly pan from side to side?
gpt
They can, which really shouldn't be shocking to you. Look at your finger and slowly pan it from one side of your vision to the other... See how smoothly that works?

But our eyes are adapted to focusing on something and maintaining that view so it can be tricky to just slide your vision around. It works best if you aren't focused on the background and just try to control your eyes, and they aren't likely to be focused on the same point during this pan. But you can certainly do it.