Talk:Ken Kaneki/@comment-111.94.35.54-20160529082936/@comment-27247962-20160529215023

It's just a matter of having enough food in your system to convert it to healing body tissue.

Since the eye is a complex organ, it could be one of the few parts that stays damaged permanently. But considering that Yamori stabbed Kaneki's eye (cornea of the eye, the lens through which we see) repeatedly to inject a fluid that paralyzes the ghoulsystem and he perfectly healed from this. I'd say, based on that, even healing an eye and eyesight would not be a problem.

But as Ishui made me aware, it's something that goes around in the fandom and not exactly something that Ishida is hinting at himself.