Myopia, a blurred image on the retina formed by the refraction of parallel light rays from 5 meters away, located in front of the retina, when the eye’s regulation is in a fully relaxed state. High myopia can have a family history and is divided into axial myopia and refractive myopia. It manifests as blurred vision at a distance and clear vision at a close distance, and correction is by spherical lenses. Astigmatism, is the refractive power of the eye in each meridian varies, some meridian refractive power is strong, some refractive power is weak. After passing through the refractive media of the eye, the parallel rays cannot form a clear image on the retina, but only focal lines, including corneal astigmatism and lens surface astigmatism. It is manifested as blurred vision, poor distance vision and near vision, and vision fatigue, with farsighted astigmatism being the most obvious, and correction is done with columnar lenses.