I. Clinical impression: (1) Amblyopia small concept: amblyopia, commonly known as the child’s visual development during the sensitive period due to various reasons resulting in normal developmental disorders of visual function, so that the child’s corrected visual acuity is lower than the normal level of children of the same age. The main manifestation is that after standardized optometry, the corrected visual acuity is lower than normal, i.e., wearing glasses cannot improve the visual acuity to normal level, and there is no organic lesion in the eye examination. Unlike myopia, which is common in our daily life, myopic eyes in general can reach normal vision after wearing suitable corrective glasses, while amblyopic eyes also have vision below the normal range after wearing glasses. (2) Treatment should be done before it is too late: because the sensitive period of human visual development is sometimes limited, during the sensitive period of visual development, amblyopia treatment is more effective, beyond the sensitive age, the treatment is more difficult and the effect is greatly reduced. Generally speaking, the most sensitive period of our visual development is within 2 years of age, and the sensitivity is still very good within 6-7 years of age, while the sensitivity decreases between 8-12 years of age, and decreases significantly in adulthood. Clinicians have the means to assess the visual function of young children and can begin appropriate treatment for infants and toddlers. In general, if amblyopia is identified, treatment is best within 2 years of age; treatment for adolescents after 12 years of age is less effective, but can be improved and improved to some degree. Second, the concept: wearing glasses to correct visual acuity lower than normal; no organic disease; the presence of causes of amblyopia. Treatment: To be treated early, within 6-7 years of age. Older children can be treated: requires double the effort and effort.