Good catch anon. Are there any disorders that go along with certain eye issues like this?
Pax2 gene perhaps? A need for organ transplants? Kidney problems?
If all your puppets need batteries (organs) to stay alive, and you alone can provide them, they sure can't disobey orders now can they?
I hit the bottom of the rabbit hole a long time ago, and doctors and nurses are down there. I'd bet they are like the rooks or the bishops of the cabal or something.