Myopia of 600 degrees in an 8 year old child is considered moderate myopia and is more serious as it significantly affects the child’s vision. The severity of myopia can be categorized according to the specific degree of myopia. Generally speaking, myopia below 300 degrees belongs to mild myopia, myopia from 300 degrees to 600 degrees belongs to moderate myopia, while myopia above 600 degrees belongs to high myopia, which will seriously affect the patient’s vision level and daily life. Therefore, myopia of 600 degrees in an 8-year-old child is a more serious eye disease. Moreover, as children at the age of 8 are in the stage of visual development and have higher eye needs, the degree of myopia can continue to increase and develop into high myopia, which will seriously damage the patient’s vision. The eye axis of patients with high myopia is often stretched too long, which can easily cause retinal detachment. Therefore, patients should avoid strenuous exercise and eye injuries. It is recommended that children with myopia should consult a doctor in a timely manner to assess their condition and follow the doctor’s instructions for treatment.