In twilight, when edward saves bella and sucks out the venom, but he also sucks out blood. Why isn't it when bella wakes up that edward's eyes aren't red?

Because Edward had been a vampire for almost 100 years, and he was immune to the human blood, because he had drank so much animal blood. that's the way I understood it from Breaking Dawn, that newborn Bampira eyes are red, and then, as they have madami control and don't consume human blood, their eyes turn that topaz color. that's why Bella had to wear contacts after she was changed when she was around humans.

Maybe it wasn´t enough blood to change his eye color or he spet it out. Well as you can see i don´t really know but it is a good question. sorry i wasn´t much of a help. (sorry about the grammar)

Remember when Bellas eyes were bright red when she was first changed and Edward sinabi that drinking animal blood would dull the color over time...So I'm guessing that he would probably have to drink alot of human blood over a span of time to make his eye color brighten up to red.

Edwards eyes arent red because it taks a while for them to turn red. it doe4snt just happen instantly. Plus bella was out for three days