You know, when you are staring at a person, that means that a little of the light that would be reflected off that person anyway is entering your eyes & being processed by your nervous system in such a way as to keep the image of part of that person on your foveas. Your eyes do not send out tendrils that feel the shape & color of the back of the person's neck. Everybody is supposed to know that these days, but it seems a lot of people don't really believe it.