For amblyopia (lazy eye) mentioned in the article, diet doesn't do anything. Diet doesn't do much for neurodegenerative disorders, either. Today, when you get alzheimer's, it only gets worse. You can't eat a lot of blueberries and suddenly regain brain function.
I thought the article was good. It didn't overhype any expectations of the drugs being tested. The research appears to be proceeding cautiously, but optimistically.