Myopia is a type of refractive error in which parallel light rays enter the eye and form a focal point before the retina, thus external objects do not form a clear image on the retina, and the patient feels that he or she cannot see distant objects clearly, but has a good ability to adapt to near targets. The near point of myopic eyes is the same as, or slightly closer to, the near point of orthoptic eyes, because myopic eyes can only see near and have limited distance, hence the name myopia. Without the use of accommodation, after parallel light rays enter the eye, they are not focused on the retina, but in front of it, so that the eye sees a blurred scene. When the scene gradually moves closer to the eye, its object image in front of the retina also gradually moves back and falls exactly on the retina, the scene is the clearest, and this is myopia. The distance between the object and the eye is the far point of the eye. The closer the far point, the higher the myopia. Myopia is divided into four types: axial, curvilinear, exponential, and spastic: 1. Axial myopia is caused by a long anterior and posterior axis of the eye and is the most common type of myopia; 2. “The main manifestations of myopia are farsightedness, farsightedness, and farsightedness. The main manifestation of myopia is poor distance vision, and some children like to squint when looking at things. Children with myopia often develop an introverted mentality because of their poor vision, and spend all day with books as friends, developing a lonely habit of isolation. Some children with high myopia read and write with their eyes very close to the book. A slight change in reading distance can make things blurry and cause visual fatigue, and myopic children are also prone to strabismus. Myopia in children should be prevented by using relaxing drops and wearing appropriate corrective glasses. Parents should also regularly urge their children to maintain a reading distance of about 30 cm.