High myopia is usually defined as myopia of 600 degrees or more, and the prevalence of this disease is currently estimated at around 10-30% in minors and less than 10% in adults. Of course, this figure is not necessarily accurate, as myopia is currently a very large group of people with a particularly high prevalence of this disease, so it is difficult to make an accurate statistic. However, high myopia is more dangerous, because the higher the degree of myopia, it will bring a variety of pathological damage, such as retina, choroidal pigmentation disorders, optic disc atrophy arc, and even may lead to the emergence of retinal detachment in serious cases. Therefore, after the eyes appear high myopia, must regularly do fundus examination.