Whether a 9 year old child with 150 degrees of myopia can be adjusted back depends on the type of myopia; it is possible to adjust back to pseudomyopia, but it is impossible to adjust back to true myopia.
Myopia can be subdivided into two different types: true myopia and pseudomyopia, which have different treatments and prognoses. Pseudomyopia is reversible. Prolonged close eye use leads to ciliary spasm, which causes pseudomyopia. Patients need to develop good eye habits and avoid eye fatigue to relieve ciliary muscle spasm, which can eliminate pseudomyopia and restore orthopia.
At present, true myopia is irreversible. If a 9-year-old child develops 150 degrees of true myopia, he or she can wear glasses to correct his or her myopia and improve his or her vision.
It is recommended that children with myopia be seen promptly for evaluation of their condition and treatment as prescribed.