"Every time a wizard looks another person in the eyes, he runs the risk of triggering a deeper seeing, a voyeuristic peep through the windows of someone else’s soul. You get a snapshot of the true nature of that person, and they get a peek back at you."
Butcher, Jim (2010-04-06). Changes: A Novel of the Dresden Files (p. 206). Roc. Kindle Edition.
When a practicing wizard and a being with a soul (all mortals along with White Court vampires and others) look each other in the eyes, it begins what is known as a soulgaze. It gives the other a window into their soul, which can’t be faked. It doesn’t relay specific information (you can’t use it to interrogate someone), but it does give one a vague impression on whether they’re trustworthy or not, or if they’ve been psychically harmed, etc. Just like if one were to use their Sight, the memory of the gaze doesn’t fade with time, being as sharp years later as when it happened. One circumstance in which a Soulgaze doesn’t occur, is when a doctor looked into Harry’s eyes. He didn’t so much as look into his eyes, as examine them, which is professional intent.
Soulgaze
Butcher, Jim (2010-04-06). Changes: A Novel of the Dresden Files (p. 206). Roc. Kindle Edition.
When a practicing wizard and a being with a soul (all mortals along with White Court vampires and others) look each other in the eyes, it begins what is known as a soulgaze. It gives the other a window into their soul, which can’t be faked. It doesn’t relay specific information (you can’t use it to interrogate someone), but it does give one a vague impression on whether they’re trustworthy or not, or if they’ve been psychically harmed, etc. Just like if one were to use their Sight, the memory of the gaze doesn’t fade with time, being as sharp years later as when it happened. One circumstance in which a Soulgaze doesn’t occur, is when a doctor looked into Harry’s eyes. He didn’t so much as look into his eyes, as examine them, which is professional intent.