samx

I was actually curious about this so I looked it up and it probably depends. Here's my guess.

In all likelihood it would be closest to chameleon vision--or being able to hold two different points of focus at once. This is because we do a lot of "focused" things that require decent vision and have evolved as predators. But, I'll add that since the way we're built is far more conducive to doing things in front of ourselves, that might end up being the "primary" focus most of the time with back-facing vision sort of running in the background/tuned out unless really stimulated or thought about.

An extreme "prey" example is the woodcock, which can't see directly in front of itself but has a near-360-degree view otherwise. This is a super general field of vision that's meant to detect (and avoid) movement from every angle, but also comes with next to zero focus. This wouldn't be helpful.

I'll also add that greyhounds have a 270-degree field of vision, but as sighthounds will absolutely lock on to things they're interested in. The extra angle doesn't really play into this part--sort of like what I figured with the chameleon part. So yeah I'd say it would mostly be in the "peripheral" category as long as it's not triggered by something.