Unless your character is VERY old (~2 year´s +) and has never been in the Dream, there is no need to interact with the eye of dreams.
You should have an item "Mysterious Summons" on you. Rightklick it & follow the instructions to begin MainQuest.
If you have been in the dream but lack the Mysterious Summons, /petition
If you have not been in the dream, you might be SOL. I'd suggest /petition as well, maybe a GM can help you.