How does heart vision treat myopia?

My friend, I have an obligation to tell you. Don't go, it's no use. I am a franchisee of Heart Vision, and I really can't do it for a few months. It's useless The headquarters complained about our poor technology, and then I asked them to send two professionals to help us for a month, but it still didn't work at all. Then headquarters doesn't care about our losses. Individual children do have a certain degree of effect, but they are far from the promised effect. In addition, the rebound phenomenon is serious. Most importantly, is this way harmless to children's eyes? There is no accurate statement. . . We must fight such people to the end!