Yeah bilberry extract has been studied in Asia since they had an increasingly myopic population. Seems that it works in relaxing the ciliary muscle spasms caused by close up vision. (screen time).

I've also tried red light therapy for the eyes. It seems to work a little too but this is more subjective for me.

I think the best thing would be to live somewhere where its sunny all the time and be outside for the first rays of sunlight.