What does amblyopia in children mean? What are the dangers? The National Strabismic Amblyopia Prevention and Treatment Group of the Chinese Academy of Ophthalmology (1985) defines amblyopia as a person with corrected visual acuity below 0.9 without organic lesions in the eye. The common causes of amblyopia include moderate or high hyperopia, refractive error, strabismus, and form deprivation. Amblyopia is a developmental eye disease of visual function. The reason for low vision is that the visual system does not develop properly. Because it is painless and itchy, it is often ignored by parents and the best time to treat it is lost. The best time to treat amblyopia is between the ages of 3 and 7, with the maximum age not exceeding 12. Amblyopia is a developmental eye disease. Early in life, the visual system is affected by various adverse factors, such as high hyperopia, strabismus, congenital cataracts and other diseases, which prevent the formation of clear images on the retina, and without the stimulation of such images, the visual system cannot develop normally. Even if these disorders are later corrected or cured, the visual function still does not return to normal immediately. In severe amblyopia, the visual acuity is less than 0.1 and can only be restored to a normal level with timely treatment. If treatment is not given in a timely manner, monocular vision and stereo visual function will be difficult to restore to normal levels.