system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What would our vision be like if we had a third eye at the back of our head?
gpt
Do you mean how would 'what we see' appear? That would depend on how our brain had evolved to use that third eye and represent it to us mentally. Since this is necessarily different from how our brains function today, there's no definitive answer to give you other than 'we could presumably see behind us, at least if we cut our hair.'