Amblyopia is usually asymptomatic and is found during the examination of monocular vision. Unlike myopia and hyperopia, amblyopia cannot be corrected to normal visual acuity with nearsightedness, farsightedness, or astigmatism and cannot be explained by organic pathology. When there is no obvious organic pathology in the eye, and the best corrected visual acuity of one or both eyes is lower than the corresponding age visual acuity, it is called amblyopia, or the visual acuity of both eyes differs by 2 lines or more, and the eye with lower visual acuity is amblyopic. The disease is an eye disease closely related to visual development, manifested by the development of the visual system showing varying degrees of visual loss, usually with monocular involvement. Monocular strabismus, refractive aberration (large difference in refractive error between the eyes), high refractive error, and form deprivation (monocular disuse) are the common causative factors. The main types of amblyopia are: strabismic amblyopia, refractive error amblyopia, refractive error amblyopia, disuse amblyopia (form deprivation amblyopia), congenital amblyopia or organic amblyopia. The main clinical manifestations are: abnormal visual acuity and refractive error, better ability to recognize individual visual targets than collective or dense visual targets, eye movement disorders, and visual impairment. Amblyopia is an eye disease that seriously endangers the visual function of children.