Medical science is not simply the implementation of statistics - there is also a rather large element of understanding the mechanisms by which things work, how they go wrong, and how it might make sense to fix them.
There are many conditions that are poorly understood, and diet is no doubt a significant factor in general health. But what HHR says here makes no sense. This condition is structural - the tissue that forms the cornea loses integrity over time, and loses its shape. It would then need to be reshaped, through advanced surgeries that are not yet well-developed.
I have no doubt that a proper diet can help with ocular health in general, in the same way that plenty of calcium is good for strong bones. But to suggest that supplements are going to reshape a deformed cornea is like saying that drinking lots of milk will correct a curved spine.