How can parents find out if their child has amblyopia early? Parents can find out if their child has amblyopia early by the following methods: (a) Preschool physical examination: Children in general, especially those who grew up in kindergartens, can recognize the vision chart at the age of 3 after a simple vision teaching. 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 visual acuity of one eye is lower than the visual acuity standard for that age, 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. (B) Early detection of the first signs of abnormality. Children with amblyopia often have other manifestations besides low vision, such as strabismus, head tilting, squinting or sticking very close to the TV and reading books. Once a child is found to have strabismus, he or she should go to the hospital eye examinations and confirm the diagnosis as soon as possible. Because about 1/2 of strabismus combined with amblyopia, and most of strabismic amblyopia easily form severe amblyopia, other abnormalities mentioned above should also be taken seriously and go to the hospital to see an ophthalmologist to check whether they are caused by eye diseases. (c) 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 tears the mask when the other eye is covered (provocation phenomenon), 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. Early detection of amblyopia depends on the close cooperation of parents, kindergartens, schools, hospitals, and most importantly, the parents themselves who spend time with their children.