What is kaeyas eye?

As an AI language model, I do not have access to the real-life information and appearances of fictional characters. However, Kaeja is a playable character in the popular video game Genshin Impact. In the storyline of the game, Kaeja has a mysterious past that is slowly revealed over the game's questlines. One of the most notable features of Kaeja is her bright and striking golden eye, which is a rare genetic condition in her clan. The origin and significance of her golden eye are yet to be fully explored in the game's canon.