Myopia above 600 degrees is generally considered high myopia. Usually, according to the degree of myopia, it can be roughly divided into three categories: low myopia, moderate myopia, and high myopia. Myopia below 300 degrees is usually called low myopia; myopia between 300 and 600 degrees is called moderate myopia; and myopia above 600 degrees is high myopia. For young children and adolescents, who are in the stage of rapid growth and development, their eyes will also develop, so they need to pay high attention to protect their eyesight and avoid myopia, especially high myopia, which can easily cause fundus-related diseases.