Myopia can reach up to more than 4,000 degrees, which is super high myopia, and is generally pathological myopia. In addition to poor distance vision, it is often associated with poor night vision, flying mosquitoes, floaters, and flash sensation. A series of pathological changes in the eye tissue also occur, including macular hemorrhage, subretinal neovascularization, leopard-shaped fundus, myopic arcuate spots, lacquer cracks, and retinal peripheral lattice-like or cystic degeneration. In addition, at a younger age, vitreous liquefaction, clouding, and posterior vitreous detachment may occur. The risk of retinal detachment, tears, fissures, macular hemorrhage and neovascularization is much greater than in normal subjects. Due to the lengthening of the eye axis, the eye is more prominent and the posterior pole of the eye is dilated, forming a posterior scleral staphyloma.