There is still no uniform classification standard for myopia, and the following classifications are common. I. Classification according to the degree of myopia 1. Low myopia: myopia with diopter lower than -3.0D (i.e. lower than 300 degrees). 2. Moderate myopia: myopia with a diopter of -3.0D to -6.0D (i.e., 300 to 600 degrees). 3.High myopia: myopia with a refractive error higher than -6.0D to -9.0D (i.e., 600 to 900 degrees). 4. Super high myopia: myopia with a refractive error higher than -9.0D (i.e. more than 900 degrees). 2, according to the refractive state classification into axial myopia and refractive myopia 1, axial myopia: the eye refractive components are basically normal, but the eye axis is long. At present, most myopia can be classified as axial myopia. 2. Refractive myopia: The refractive power of the refractive interstitium of the eye is too strong (e.g., myopia due to increased lens density in patients with early cataracts), but the axis of the eye is normal. 3.Curvature myopia: most commonly, the curvature of the cornea or lens is increased, such as cone cornea, large or small cornea, after corneal transplantation, spherical lens or small crystal. 4. Adjustment myopia: Myopia caused by prolonged near eye use, overuse of adjustment, tension and mediation spasm, which disappears after resting or using ciliary muscle paralyzing agents, is called adjustment myopia, also known as “pseudomyopia”. The majority of myopia occurs in adolescence, progresses slowly, has a low prescription and good corrected visual acuity, and generally stabilizes or stops around the age of 20. Most acquired myopia can be classified as such. Pathological myopia: Also known as malignant myopia, degenerative myopia, high myopia, and progressive myopia. It is characterized as occurring at birth or early after birth and has a genetic component. It is characterized by rapid development, continuous progressive deepening, and marked progression of myopia in adolescence; high myopia, generally higher than -6.0D (600 degrees or more); marked prolongation of the eye axis, early appearance of fundus lesions and continuous progressive aggravation; marked impairment of visual function, low distance vision, often not fully corrected (even with the most suitable glasses, it is difficult to see 1.0 or more on the visual acuity scale), and most Most patients have fair near vision, but in severe cases, near vision is also lower than normal. Because there are many causes of myopia and different treatment methods for different types of myopia, experts recommend that once you find out that your child or family member is myopic, you should go to a regular eye hospital in a timely manner, especially if pathological myopia is often complicated by other eye diseases and requires close follow-up.