My interpretation of the black eye thing is that there is some sort of ritual that involves (temporarily) losing sight as a sacrifice for supernatural insight. It probably involves allowing a priestess with a sap glove punching them. I've noticed that it's usually the left eye. And I suspect, that the symbolism relates to the Norse god Odin and the tale about him sacrificing his eye in exchange for true wisdom.
Q drew attention to it. But he didn't tell us what it was all about.