Hi, knowing the fact that he is myopic or short sighted, he has to wear glasses in order to see images clearly. If he fails to wear glasses he will not see distant objects at all. Considering his age, best option is glasses alone, later he can opt for contact lenses or refractive surgery to remove glasses. Plz understand that glasses cause no harm to eye muscles but only improve his quality of life and also his academic growth.
Next Steps
Get a refraction done and start wearing glasses constantly.
Health Tips
Get dilated retinal examination annually to look for any myopic retinal changes.