Here's a great clip from Batman Begins (my favorite of them...yes I enjoyed it more than The Dark Knight) This is a good example of eye direction. As Liam Neeson starts to tell the story of his past his focus goes away from Christian Bale & goes more inward. You really get the feeling that he is thinking back on the past. What I also like about this sequence is that it starts with Bale not wanting to look at Neeson. Bale is having to confront his past and he doesn't want to, so he avoids eye contact. It's not until Neeson starts telling his own story & Bale learns how similar the two of them really are, that he looks up at him. You can really use eye direction to help tell the audience what a character is thinking & the relationship between characters.