good actors tend to have really dilated pupils in scenes. it's a sign of intense focus. when a person listens with so much focus that their pupils are dilated, sometimes the affect on the other person is hypnotic. maybe it's because feelings of fascination and attraction also dilate the pupils, so these potential signals heighten the experience for the person being listened to. i'm not sure. i think the reason why people find my eyes intense or fascinating is because my pupils tend to be dilated.