Also, I think I know how to look beyond things.
you see, you will know which one is cross eye viewing and which one is parallel viewing.
Try cross eye viewing and you will feel like you are looking back(not looking the object, but in front of it.)
But when you do parallel viewing, you will feel relax. Begin by making the object come really close to you, and than try to focus on it, then let go! focus anything that is far away from the object.
I hope that help...(probably not... Alex's post is way better than me.)
-Harris