Talk:Ken Kaneki/@comment-3173617-20150722171121/@comment-26273914-20150722195056

He's been having eye problems for a while though, His mother used glasses and Ken seems to have asthenopia (eye fatigue)

I have a few theories regarding that:

1- Maybe the regeneration power has no effect on wounds or illnesses that were there prior the kakuhou transplant

2- Ghouls get old, that implies that their regeneration ability is not absolute, it just affects external damage, so maybe they can get sick and die of natural causes like a normal human.

That's all for the reason his eyes keep getting worse

---

Now, I think the RC supressants don't mess up with the RC cells, they just make the kakuhou stop for a while, thus stopping the RC cell flow, making the regeneration slower and the kagune weaker.

And as Blue Luna said, it hasn't been confirmed that they give Haise supressants all the time or else he would always be tired like the ghouls in cochlea. I think that he seems weaker than back in tokyo ghoul because he's subconsciously holding himself back so he doesn't become a man-eating monster once again (Haise believes that Kaneki used to eat humans) and there's also the fact that he doesn't eat as often as he did back then.

This is just my opinion though, so take it with a grain of salt