Myopia can reach up to more than 4,000 degrees, which belongs to ultra-high myopia and is usually pathologic myopia. In addition to poor distance vision, which is often accompanied by poor night vision, floaters, floaters, and flashes of light, a series of pathological changes in ocular tissues can occur, including macular hemorrhage, subretinal neovascularization, leopard-shaped fundus, myopic arcuate spots, lacunar crackles, and peripheral latticework or cystoid degeneration of the retina. In addition, vitreous liquefaction, clouding, and posterior vitreous detachment may occur at a younger age. The risk of retinal detachment, tears, lacunae, macular hemorrhages and neovascularization is much greater than in normal subjects.