High myopia is clinically defined as refractive error >-6D, i.e., myopia >600°, and is usually caused by a combination of genetic and environmental factors. In addition to significant vision loss, patients with high myopia are often associated with fundus pathology, such as retinal detachment, flying mosquitoes, posterior scleral vitelliform hemorrhage, macular hemorrhage of the eye, and other visual impairments such as reduced visual acuity and night blindness. Therefore, it is recommended that patients with high myopia should pay more attention to protecting their eyes in daily life, and once abnormalities are detected, it is recommended to seek medical attention in a timely manner. 1, retinal detachment: high myopia may cause serious retinal detachment, mostly due to high myopia caused by posterior vitreous detachment, which in turn pulls the retina and causes a sudden feeling of floating objects in the eye, or sudden blurring of the field of vision, etc.; 2, flying mosquitoes: the age of Increase in age can lead to physiological mosquitoes, but some highly myopic young people with vitreous degeneration, may also appear mosquitoes. Often manifested as a sudden black shadow in front of the eyes or with an abnormal flash, like a lot of flying mosquitoes in front of the eyes, can also be accompanied by blurred vision, vision loss and other symptoms; 3, posterior scleral grapevine: usually due to high myopia caused by the formation of a bulge in the spherical wall thinning, which can lead to vision correction difficulties; 4, macular hemorrhage: some high myopia can cause retinal degeneration, the examination can be seen in the fundus of the photophora 5. Decreased ability to see things: some highly myopic patients have macular degeneration, which may lead to distortion of vision or decreased ability to recognize redness; 6. 8, glaucoma: high myopia patients often have changes in the structure of the eye, which often leads to obstruction of intraocular aqueous circulation, thus increasing intraocular pressure and triggering glaucoma; 9, macular fissure: high myopia patients with degenerative retinal disease, which can lead to damage to the retinal epithelial tissue, causing fissures in the macula, seriously damaging the patient’s vision.