220 degree myopia in an 8-year-old child is usually related to environmental factors, lack of micronutrients and genetic factors, and can be treated conservatively or surgically according to the cause. 1. Environmental factors: such as long-term close viewing of cell phones, TV, resulting in gradual shortening of the eye axis, may cause myopia, visual acuity can reach 220 degrees. Usually, you should strictly control the time of using eyes and avoid watching TV for a long time. You can choose to wear frame glasses according to medical advice. 2. Lack of micronutrients: Prolonged lack of vitamin A may affect vision, leading to low vision and causing myopia. To address this factor, we need to supplement the trace elements needed by the human body in time. If the visual acuity reaches 220 degrees, which affects the normal work, we need to wear glasses. 3. Genetic factors: congenital myopia, such as visual acuity reaches more than 220 degrees, affecting normal life, you can first wear frame glasses. If the myopia of an 8-year-old child reaches 220 degrees, it is recommended to go to the hospital regularly for review, and the doctor will choose the best treatment according to the results of optometry.