I can see only in a limited area at any given time, but I can hear in a full sphere around me simultaneously. I don't think it's accurate to characterize such a large area as "the periphery". One sense is imprecise and covers pretty much everywhere while the other is detailed, but very limited. Both senses work in concert to build a full map of the world, and the loss of either is concerning. I'm more comfortable in a blindfold than isolating headphones though, because I can still echolocate while my vision is impaired, but my vision has no way of emulating hearing's function. I'd have to be constantly looking around all over the place.