The eyes don’t lie is a popular saying, which made people think that it could be used for lie detection. The problem is that the eyes communicate the pattern the person is experiencing at that moment in time.
If you ask someone to picture a purple tree, you will see their eyes go to Visual Construct because they’ve never been asked to picture a purple tree, so that person will construct a purple tree from the knowledge of what a tree looks like and what colour purple is to them. If you ask the same question again, that person’s eyes go to Visual Recall because they now have an image of what a purple tree looks like. There is also the risk that someone else has asked them to picture a purple tree before you, and then their eyes will go to Visual Recall.
To compound the problem, there are people who are called normally organised, those people in the majority have eye patterns that Visual Construct are to their left and Visual Recall are to their right. There are people who are reverse organised, where their eyes go the other way and there are hybrids that have different directions for the different states.
Visual is up, auditory (listening) is in the middle and down is both kinaesthetic and auditory digital (internal processing). Staring straight at you means they know what they are talking about and its in their frontal cortex ready to come out and looking round in a circle (transderivational search) means they don’t have a clue what you are on about, so they are trying visual, auditory, kinaesthetically and auditory digital to try to get an answer.
Note that this is a conscious search, if the person is in a trance they will more likely be looking straight at you.