Amblyopia is a visual condition in which the best corrected visual acuity is less than 0.9 (0.9 applies to those aged 5 years and above, and should be adjusted downward to 0.8 for those below 5 years of age, and 0.6 for those aged 3 years and below), and can be divided into amblyopia formed with obvious organic pathology, and amblyopia caused by no obvious organic pathology. Amblyopia is an eye disease that seriously endangers the visual function of children. If amblyopia in children is not detected and treated early, it will lead to low vision in one or both eyes, which will seriously affect binocular vision and lead to fusion loss and stereo blindness. Amblyopia is a curable disease if it occurs during the sensitive stage of visual development. How can parents detect amblyopia in their children early? Parents can detect amblyopia early by the following methods: 1. Preschool physical examination: In general, children, especially those who grew up in kindergartens, can recognize the visual acuity table at the age of 3 after simple visual recognition. Kindergartens that have the conditions should conduct an annual census screening of children’s eyesight, and parents can also purchase a standard vision chart and hang it on a well-lit wall at a distance of 5m for their children to identify. If the vision of one eye is below 0.8, the child should be taken to the hospital for further examination. It is generally believed that it is best to check no later than 4 years old. 2, early detection of the first signs of anomalies: children with amblyopia often have other manifestations besides low vision, such as strabismus, skewed head, squinting or close to watch TV and read books, and so on. Once a child is found to have strabismus, he or she should go to the hospital ophthalmology department for examination and diagnosis as soon as possible. Because about 1/2 of the strabismus combined with amblyopia, and most of the strabismic amblyopia easily form severe amblyopia, the other abnormalities mentioned above should also be paid attention to, and should go to the hospital to see an ophthalmologist to check whether it is caused by eye disorders. 3, for infants and young children who cannot cooperate with the vision check, a masking test can be done to get a general idea of binocular vision: intentionally cover one eye and let the child see with one eye, if the child is quiet after the masking and cries or scratches the masking when covering the other eye (irritation phenomenon), then it indicates that the vision of the uncovered eye is very poor and should be checked and necessary treatment should be taken at the hospital as soon as possible.