It can be said that amblyopia is caused by an abnormal visual environment that leads to visual deprivation. The so-called abnormal visual environment includes: 1. Image deprivation. Ptosis, refractive interstitial clouding such as cataracts, and refractive error that improperly covers one eye are all considered image deprivation. 2. Refractive aberration. The imaging of both eyes is not as clear, which is the image deprivation. 3.Strabismus. Visual deprivation in strabismic eyes is axial deprivation. All of the above abnormal visual environments can lead to different forms and degrees of damage to the retina, lateral geniculate body and visual cortex of the visual system, resulting in the occurrence of amblyopia. In addition, binocular interactions and active inhibition of the brain’s visual cortex can cause amblyopia. Thus, amblyopia is not a single factor disease, and its pathogenesis is quite complex and not yet fully understood.