How can you tell if you can see peoples auras?

You know that distortion when heat rises off of a road? The aura around a person is like that to a person who's astral vision is weak or only developing. This distortion is more obvious when a person is talking about something they love to talk about or are excited. When they are "in their element", so to speak.

When astral vision is more highly developed you can begin to see color in auras and connections in the universal energy.