I believe that this limitation on human eyesight is really a strength. In fact, it may be one of the keys to my puzzles about the color red. At last, I feel I have some reasonable explanations. I don't know how or why I overlooked such an obvious factor. It is perhaps the main difference between photography and human eyesight.
Human vision is very selective.
Unlike the camera that automatically captures an entire scene with every detail in a fraction of a second, the human eye uses the brain as a kind of interactive film. Living vision is like film with feedback. The brain selects and activates particular regions of the visual field. Much of what is in our field of vision is ignored. The portion that becomes the focus of attention gets special treatment.