1) Simple myopia: Most patients have no fundus lesions and progress slowly. Vision can be corrected to normal through appropriate lenses, and most other visual function indexes are normal.
(2) Pathological myopia: visual function is obviously impaired, far vision correction is not ideal, near vision can be abnormal, and fundus lesions of different degrees can occur, such as arc leopard-print fundus and macular hemorrhage or neovascularization in myopia, and irregular white atrophy spots or round black spots (Fuchs spots) with pigmentation can appear; Lattice degeneration and cystic degeneration in the peripheral part of retina; Vitreous liquefaction, opacity and posterior vitreous detachment occur at a younger age. Compared with normal people, the risk of retinal detachment, tear, hole, macular hemorrhage, neovascularization and open angle glaucoma is much greater. Often the anterior and posterior diameter of eyeball becomes longer, the eyeball becomes more prominent, and the posterior pole of eyeball expands to form posterior scleral staphyloma. Those with the above clinical manifestations are pathological myopia.