When it comes to amblyopia, parents and friends may not be familiar with it. Some people say, as the name implies, amblyopia is poor vision, so just get some glasses. Actually, it is not true. Amblyopia is different from common refractive errors such as myopia, astigmatism and hyperopia. Pure refractive errors can be corrected to a normal 1.0 vision through optometry, but amblyopia cannot. The medical definition of amblyopia is: except for various organic pathologies, the best corrected visual acuity of the eye is less than 0.9. Patients with amblyopia cannot see clearly with both eyes at the same time and cannot form three-dimensional vision; after missing the time window for treatment, it is impossible to improve visual acuity with the current medical conditions. In other words, once amblyopia is diagnosed, it means that the affected eye cannot achieve 0.9 vision even with the most suitable glasses. Moreover, if the treatment is not done before the age of 10, the child’s amblyopic eye has no hope of being cured for life, and he or she will not be able to see clearly or have stereo vision for life, and will not be able to drive or work in a job that requires stereo vision such as depth perception. The effectiveness of amblyopia treatment is closely related to the age, the younger the child, the better the treatment, while in adults there is no hope for a cure. Therefore, parents and friends must pay great attention to amblyopia, it is best to go to a regular hospital to check the vision of children around the age of 3 years old at the latest before 5 years old, once the discovery of amblyopia, early treatment for a cure, to give children a bright future.