As far as Chinese medicine is concerned, it is very difficult to achieve the goal. The difficulty described by Chinese medicine is like "driving water to heaven"

What's more, the longan you mentioned has no effect on the eyes, but it is ok to nourish the body.

Traditional Chinese medicines that affect the eyes mainly include "cordate telosma", "mulberry" and "chrysanthemum". In food, the same is true of the "dryness" of seafood.

However, the therapeutic effect of these things on the eyes is almost negligible.