I've been recently introduced to you as an author, and I heard "lighteyed" and "darkeyed." What is that?
So, in The Stormlight Archive, their ethnic divisions in one of the cultures is by eye color. It traces back to when there was an ancient magic that eye color was related to, and in the modern culture, if you have lighteyes (like you), that's nobility. If you have Darkeyes (like you), you are not noble, you are... you know. So, instead of dividing by skin color or by nationality, they are much more interested in eye color. But that's only one of the cultures, that's a big important one.