Generally, myopia does not progress into adulthood, but continues to develop after the age of 25. In terms of refractive error today, they are called high myopia because they all exceed 6.0D. This type of myopia is also known as pathological myopia or degenerative myopia because of the pathological changes in the eye. High myopia has an obvious genetic component, which is autosomal invisible in domestic investigations. Almost all high myopia eyes have axial growth and significant thinning of the sclera at the posterior pole of the eye, with the main pathological changes being atrophy and thinning of the retina and choroid, which worsen over the years. As a result, many serious complications arise, most of which can lead to blindness, and it is the 6th most blinding disease in China. The main complications are: high myopia can not be ignored 1, flying mosquitoes: high myopia can occur true vitreous degeneration or liquefaction, causing obvious flying mosquitoes. Self-awareness of light, sparks, flashes or black shadows drifting in front of the eyes. 2, posterior scleral chylomalacia: mainly manifested as the posterior pole of the eye backward expansion, is the nerve and macula around the retina degeneration, atrophy, corrected vision loss, the higher the degree of myopia, the higher the incidence. 3. Cataract: Highly myopic eyes develop cataracts earlier than normal people, and they are mostly core-shaped cataracts. The difficulty of cataract surgery is often increased due to the relaxation of the suspensory ligament, and the good or bad recovery of vision after surgery is related to the degree of retinal lesions in the fundus. Glaucoma: The incidence of open-angle glaucoma is 6 to 8 times higher in highly myopic eyes than in normal people, but because the clinical symptoms of glaucoma are not obvious and the decline in visual function is often hidden by the symptoms of high myopia, it is easy to be ignored. High myopia is also commonly associated with clouding of the posterior lens cortex, and the dark adaptation time is relatively prolonged due to lesions in the pigment epithelium of high myopia patients, which affect the photochemical reaction process of the optic cells. Because high myopia has many complications and can seriously affect visual function, patients should pay close attention if they experience dark shadows in front of their eyes or vision loss. It is recommended that patients with high myopia regularly go to a specialist hospital to have their fundus and intraocular pressure checked to facilitate early detection, diagnosis and treatment.