Curse of Itachi's eyes

[Wildtangent]

There are many fatal diseases. Many are dependent to different parts of the body. EX: Lung cancer is fatal but only in the lungs. Just cause you have a disease doesn't mean it affects the whole body. Without know the disease, anything we think is just a theory and only a theory. It can never become a conclusion.

Another note, diseases don't spread to the eyes. Eye diseases are only for the eyes and have nothing to do with diseases in other areas of the body. Only a few are known to affect the whole body and those are brain diseases as the brain controls every aspect of the body. Itachi showed no signs of any brain injuries or diseases and Kishi never hinted at any.

Just so you know... Diseases do spread throughout the body, cancer included. My aunt for instance died of breast cancer. It spread to her bones and eventually her brain. She was in an extreme amount of pain and eventually had memory loss ( to the point were she forgot who I was). One of the biggest concerns doctors have is for it to spread to the bones. At that point is is basically incurable. Cancer ( although less likely) can also spread to the eyes. Lung cancer is the same way. Sure it may be found in the lungs, but that doesn't mean it wont spread to the rest of the body.