Why can't vampires see themselves in the mirror?
Some people came up with some ideas but I don't believe any of them are accurate.
Answer: Vampires don't have souls, so they can't see their reflection
My response: Dogs don't have souls either but they can see their reflection. Also, I can see my dining room table in the mirror and it doesn't have a soul either.
Answer: Vampires don't reflect light, thus its aversion of it and danger to it. Thus not being able to reflect light and as such when you look at him through a reflected image in a mirror, the image isn't there.
My Response: Our vision is based on reflected light. If the Vampire doesn't reflect any light, we couldn't see them with our eyes regardless if a mirror was involved or not.
Also, can you see their clothes in the mirror?