Abstract: the prevalence of high myopia is very high, about 1%. High myopia can cause many serious complications, most of which will cause blindness. It is one of the common causes of blindness in adults, accounting for the sixth place in China., If high myopia astigmatism is not treated in time, it will seriously endanger vision. What are the hazards of high myopia astigmatism? If high myopia is not treated in time, it will cause retinal detachment and other diseases, and if high astigmatism is not corrected in time, it will cause headache and so on. Attention should be paid to these eye diseases. I. the harm of high myopia the prevalence of high myopia is very high, about 1%. High myopia can cause many serious complications, most of which will cause blindness. It is one of the common causes of blindness in adults, accounting for the sixth place in blinding diseases in China. The main complications are: 1 Posterior scleral staphyloma: the incidence was 77. 1%。 The main manifestations were posterior expansion of the posterior pole of the eyeball, degeneration and atrophy of the optic nerve and perimacular retina, and decreased corrected visual acuity. The higher the degree of myopia, the higher the incidence of posterior scleral staphyloma. 2. Retinal atrophy, degeneration, hemorrhage and hole: due to the lengthening of ocular axis, posterior scleral staphyloma and other factors, patients with high myopia are prone to retinal degeneration and hole, resulting in hemorrhage and retinal detachment, leading to blindness. 3. Retinal detachment, cataract and glaucoma: due to scleral expansion and retinal degeneration, the chance of retinal detachment in patients with high myopia is 7-8 times higher than that in patients with non high myopia. The chance of high myopia complicated with cataract and glaucoma is also higher than that of normal people. 4. Subretinal neovascularization: the incidence is 5% – 40%. It is manifested as subretinal neovascularization in the posterior pole, causing bleeding and affecting vision. High myopia will not only affect daily life, but also bring many complications to patients, such as retinal detachment, cataract, macular hemorrhage and macular degeneration, vitreous liquefaction degeneration, glaucoma, etc. the higher the degree, the greater the possibility of complications. In serious cases, it will also lead to blindness and eyeball atrophy. Severe and impact head movements, such as football, basketball, diving, weight lifting, emergency braking, etc., may cause retinal detachment. If you don’t pay attention to your diet, eat a lot of spicy food and drink alcohol; It will cause repeated bleeding in the macula of the fundus. II. Harm of high astigmatism {the cause of astigmatism is incorrect corneal radian. Most of them are congenital, but individual eyelid long chalazion will also appear astigmatism after long-term compression of the eyeball. Astigmatism is myopic hyperopia, or one path is hyperopia, and the other path is myopic so-called mixed astigmatism. If high astigmatism is not corrected, it is easy to cause headache, eye acid and other phenomena, as well as bad posture such as crooked head; Therefore, those with severe astigmatism must be corrected. Astigmatism is usually corrected with ordinary glasses or contact lenses. Astigmatism is generally congenital, but there are also acquired individual reasons that can cause strabismus. The simplest example is; Trauma and long chalazion on the eyelid are not treated in time, which oppresses the eyeball for a long time and causes the harm of astigmatism. In some cases, astigmatism will also be combined with pseudomyopia. At this time, the part of pseudomyopia should be removed, and astigmatism should be corrected with glasses.