Vampire eye color is an indicator of their diet. Red eyes are reserved for newly changed vampires and vampires that feed on the normal vampire diet. That would be human blood. That's why Bella would have no reason to see Edward's eyes as red in the first book. He's a "vegetarian" vampire. That means he doesn't feed on human blood. He survives by drinking animal blood, so his eyes assume a nice golden color. When vampires, like Edward, haven't fed in quite some time, they get hungry. As the hunger increases, the eye color changes. The color drops out, and the eyes become a black color. So once Bella knows what Edward is, she is able to tell when he needs to go hunt. If his eyes are black, he's hungry.
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