I've always thought that "hazel eyes" meant, well, hazel eyes 😀 As in a sort of a reddish or lighter brown.
Looks like the 'ole Oxford English Dictionary (for American English) says
a reddish-brown or greenish-brown color, especially of a person's eyes: [as modifier] : the laughing hazel eyes were serious now.
Lemmy can be a bit confusing if you're not a huge nerd like a lot of us are 😅 I'm sure people here (me included!) will be more than happy to help though, if you have any questions?