The common complications of high myopia include macular hemorrhage, retinal fissure, retinal detachment, glaucoma, cataract, etc. High myopia is also considered to be a pathological myopia because it is prone to complications such as cataract, glaucoma and various fundus diseases, in addition to its own refractive error. The axis of the eye is equivalent to the length of the front and back diameter of the eye, and each 1mm increase in the axis of the eye can cause approximately 300 degrees of myopia. In highly myopic patients, the eyeball is excessively elongated and the retina in the fundus is overstretched, which is prone to degenerative zone, and the degenerative zone is prone to fissure. Once the fissure appears in the retina, the liquefied vitreous body in the eye can enter into the subretina through the fissure and cause retinal detachment. Secondly, due to the excessive stretching of the retina, the macula, an important structure of the retina, is also stretched and destroyed and macular hemorrhage occurs. In addition, the retina of highly myopic eyes is stretched and thinned, the blood vessels are sparse, the blood and nutrient supply is insufficient, and it is more unable to tolerate the damage to the optic nerve caused by high intraocular pressure, which makes it easy to form glaucoma. At the same time, high myopia is a pathological change that changes the environment and metabolism in the eye, which makes it easy to form cataracts. Therefore, patients with high myopia must have regular eye checkups at the hospital so that early detection and early diagnosis and treatment can be achieved if corresponding complications arise. In summary, high myopia is a high-risk group for glaucoma and cataract, and high myopia is prone to complications of many fundus diseases.