Eye 900 degrees is a relatively high degree, for myopia is a more serious degree. Generally higher than 600 degrees is considered high myopia, and 900 degrees is 300 degrees higher than 600 degrees, so myopia is more severe. Usually high myopia is associated with fundus pathology, such as macular degeneration or retinal splitting and retinal hemorrhage. The risk of developing these diseases is much higher than normal, even 6-7 times higher. Therefore, patients with high myopia need to have their fundus reviewed once a year to rule out retinal degeneration as well as fissures. If these conditions are present, timely laser treatment is needed to prevent retinal detachment. People with high myopia also have a much higher risk of cataracts as well as glaucoma than normal people. Patients with a family history of these conditions need annual follow-up for these items, especially intraocular pressure as well as fundus screening to rule out glaucoma, which is also very important.