Eyes that change colour are read as a shift in how you see the world or how others see you. Dream books link it to transformation and a newly revealed side of a person.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.