There are many ways you can do to ease his myopia by having a good quality rest, a balanced diet and more eye exercises. As we all know, when we fall sleep, muscles of our eyes are fully relaxed reducing the fatigue greatly. The increase of our eyesight degrees is attributed to eye fatigue. Besides, the stronger the muscles, the less strain. So if your son exercises his eyes regularly, he can protect his eyesight absolutely. Further, there is a growing concern about the relationship between myopia and our daily diet. In order to prevent myopia, we are advised to eat less carbohydrate foods, over-cooking protein foods and sugar. Excessive intake of them will lead to the abnormal calcium metabolism causing deficiency chromium and calcium, both of which are important to the regulation of hydraulic body eye. What is more, it is wise of you to add some high-in calcium food including cheese, almonds and green leafy vegetable to maintain the balanced state of calcium.