Expanded peripheral vision is not solely a lack of centrally-focused vision.
It is that, yes, but if that's where our definition ends, we're missing something vital, no?
The "lack of focus" of an open periphery doesn't really give you an idea of what peripheral vision is, only what it isn't. If you're gazing across a landscape, your focus softening can be spoken of in the same breath as your periphery gaining a kind of energy, a vitality.
You can achieve a lack of focus by releasing your focus altogether, without necessarily gaining in your peripheral focus. It's a kind of sedation.
You can "relax" tense muscles by dissociating in certain ways, without necessarily reorienting to something that's not what was — it's not tension — but it's not just nothing.
Peripheral vision, or a kind of aliveness-emptiness in the body, isn't nothing.
It's just harder to talk about.
(Words are kind of yang in their essence, perhaps, and how to speak of yin qualities other than with silence?)
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Love, LB