How is high myopia formed?

The eye is equivalent to a camera. It is the window of the soul. It means that things from the outside world pass through the refractive system of the eye and form a clear image in the eye. Children are born with farsightedness. As children grow up slowly, they will become emmetropia at the age of 78 or 9. Overuse of the eye will become myopia. Overuse of the eye will be elongated, from emmetropia to myopia.