1, poor distance vision, eyes easily dry and fatigue, affecting the quality of learning, life and work; 2, medium to high myopia, will lead to eye protrusion, affecting the appearance; 3, further education, military, civil service and job search restrictions; 4, after the elderly because of blurred vision and must be equipped with two pairs of glasses; 5, myopic patients have a higher incidence of cataract, glaucoma than normal people; 6, medium to high myopia, especially high myopia is prone to vitreous turbidity, retinal detachment and macular degeneration and blindness.