The sheer volume of information the eyes take in at any moment is incomprehensible. Look around and take note of everything you see. If outside, notice the trees, cars, people, and everything in between. If sitting at a desk, take note of the pens, paper, notebook, and all the other material in front of you.
The mind processes these objects so fast you're not aware of the processing happen. You simply move your eyes in a direction, and they instantaneously detect and understand what is there.
When we read, however, things are not quite as smooth and fluid. It takes time and effort to process words, and the meaning conveyed by those words. For many, reading is a demanding activity that consumes a lot of mental energy. For some, it is so demanding, they avoid reading altogether. So, the question is why can't we process text the same way we process other objects in our environment?
The truth is we can!