At birth, the infant’s eyes and brain are not well developed and vision is very poor. The newborn only responds to bright light stimulation, that is, only light perception. In the early postnatal period, due to external stimuli, the visual system develops rapidly and vision gradually improves. If both eyes or one eye are disturbed by adverse factors such as refractive error, refractive aberration, strabismus, etc. during this stage, so that the visual system does not receive normal stimulation and the development of visual pathways is affected, amblyopia may arise.