We’ve all seen it or at least heard about it–someone speaks at length about a topic that is boring, incomprehensible, or long-winded, and the audience’s “eyes glaze over.” What is the physical configuration of the eyeball that causes us to perceive this?
Is it the focus point? People have a highly evolved ability to read the movement and positioning of eyes to be able to tell what someone is looking at. It’s obvious enough that an eye is looking in one direction or another, but I’m not sure that we can tell whether it is focused on the object that it appears to be aimed at. We do talk about people “staring off into space,” but I’m not sure how we distinguish between that and “staring at something.” Do we subconsciously read the convergence point of the two eyes to deduce this?
Or perhaps it is a general perception that is based on the whole of body language, including the areas surrounding the eyes, and it’s not an eyeball phenomenon at all.