Hmmmmmm, I guess I'll try and take a stab at this one.
Astral vision, to me, is what I see when I am in the astral realm, or when I am seeing the astral realm.
For example, if you have an astral projection, then you will be using your astral vision to percieve what is around you. However, you don't HAVE to be in a projected state to see the astral environment. It's quite common to be relaxing in bed, on the borderline of sleep, and all of the sudden, you realize that you're seeing through your closed eyelids! In cases like this, you're actually seeing with your astral vision as well.
As far as auric vision goes, I usually associate that with a non-projection. For example, I could use auric vision right now and look at your arm, and 'see' your aura. I don't have to be in the astral realms to do so.
What is the difference between Astral vision and Auric vision?
Cheers for any insightful responses!
-Pat