The Twilight franchise had its very own unique version of vampires, and among their most defining physical characteristics was the differing colors of the Twilight vampire eyes — here’s why they changed and what each color of vampire eye means in Twilight. Starting with Stephanie Meyer's book series of the same name, the story at the heart of Twilight features a long timeline that, although the focus is on the present, has a backstory going back 1500 years. Throughout that history, characters' eye color changes, based on their current lifestyle and choices.

https://screenrant.com/twilight-vampire-eye-colors-golden-red-meaning/