Most people believe the vision system exists solely in the eyes.
In reality, the eyes make up only a small part of the system. Think of the eyes like a camera in a TV studio, because, just like that camera, all the eyes do is pick up the image. For you to get it in your living room, it must be processed through control rooms, a transmitter, an antenna on their tower, possibly through a satellite or cable system, or your own antenna, and finally by your TV set. Before computers came along to make a lot of the processing decisions, it took a small army to run a TV station. And home TV sets had to be constantly adjusted.