Attention span means the amount of time one can concentrate on a certain task. I am wondering what is the spatial equivalent to describe one's attention "space" as we are capable of perceiving and paying attention to a lot of different things simultaneously. Some like attention range/ attention realm came up in my head but I do not think they are the correct ones.
which pertains to distance
field of view
which pertains to, you know, the area of the visual plane that is in
which has a more general meaning, but means depth of field in optics. The focus range is the sum of all possible depths. If these are limited, one is either near- or farsighted
All these may reduced if starring to long at screens. But this doesn't capture what you want to say. Instead, some terms convey negative connotation, like tunnel vision.
But vision isn't static, if the rapid eye movement plays a role. Dexterity, felicity, velocity, aptitude, ... don't strike me as very focused on optics.