How can you improve your eye sight naturally?

Probably not. Unless you have some treatable eye disease which lowers the sight and will improve with treatment then there is no natural agent that will help vision meaningfully. Herbals such as eyebright and bilberry are promoted by naturopaths as vision aids, but have not been proven to actually work. Eye exercises can be done, but these have not been proven. See your ophthalmologist for the best advice.