Interesting. This suggests that her initial Eyes Of Evil are incomplete, and once certain conditions are met(such as copying the other incomplete parts from people that happen to have them) then her eyes become more complete and powerful. This seems like a fun game of collect-them-all, so I'm looking forward to her completing her collection and becoming even more op. :3
@Tatsuya-Kai If my above theory is correct, then for now it'll just be basic night vision as it's currently incomplete. But once she gets the other incomplete parts for it then she might very well be able to see the unseeable as well as truth and lies.
@Archomp @Hollow7F As Mewth mentioned, it was a hereditary skill at first and thus was passed down through his family. However, now that the "conditions" have been met(which probably means that the skill was seeking the one that has the Evil Eye it was associated with, in this case Isabella) it's no longer hereditary and thus can no longer be passed down. Bit of a downgrade for Ursch's family on their own, but the fact that Isabella is marrying into his family then there is a possibility the eyes themselves might get passed down instead. Just a matter of whether or not it gets passed down to any of their children regardless of gender or only daughters.