How many miles away can a person see

Different aspects of visual information travel along parallel paths. Researchers now know that the primary visual cortex together with a nearby region acts like a post office in sorting, routing, and integrating the variety of information that the neurons bring. A third region detects shape, such as the edge of an object, and motion. A fourth area recognizes both form and color, whereas a fifth one constantly updates maps of the visual data to track movement. Current research indicates that as many as 30 different brain areas process the visual information the eye collects! But how do they combine to present you with an image? Yes, how does your mind “see”?
“Seeing” With One’s Brain
The eye gathers information for the brain, but it is the cortex that evidently processes the information that the brain receives. Take a picture with a camera, and the resulting photo reveals details of the whole scene. But when your eyes observe the same view, you consciously observe only that part of the scene on which you focus your attention. How the brain does this remains a mystery. Some believe that it is the result of a stage-by-stage integration of visual information in so-called convergence zones, which help you compare what you see with what you already know. Others suggest that when you fail to see something in plain view, it is simply because the neurons controlling attentive vision are not firing.