Imperial Lore: “third eye” feature

[Tensaihime]

Question, did Cid mention that only pureblood Garleans can have it, or was it from somebody else? I'm wondering because it could be either be something that we've never gotten the truth of (propaganda and rumors) or if said NPC is a rare exception. And considering her 3rd Eye is black, does that mean it doesn't work, or does it work differently than a normal 3rd Eye?

During the pre-Garuda cutscene, Cid does say that only pureblood Garleans have a third eye.