The best way to preserve a child’s vision is to let them see things their way rather than yours.
Over half the people in the United States wear corrective lenses, and almost all of them are capable of seeing much more clearly - if they would only experiment with changing their ideas about vision.
I've found, however, that real change only comes when we let go of the struggle, when we stop trying, and that the greatest key to healing our vision is also the simplest one: expanding our awareness.