If both eyes are amblyopic but have the same or similar visual acuity, masking is often not possible, but if the difference in visual acuity between the two eyes is two lines or more, masking of the better eye is an option. For amblyopia caused by refractive error and other reasons, if the degree of amblyopia in both eyes is the same or similar, it is not possible to use masking therapy, and the main purpose is to train both eyes so that they can continue to improve and recover synchronously. For amblyopia caused by various reasons, it is necessary to determine whether it is caused by refractive error, strabismus or other reasons, and correct or treat the cause of amblyopia first. If the child has amblyopia in both eyes with a difference of two lines or more, the good eye can be covered for a certain period of time according to the degree of difference between the two eyes. It is recommended that amblyopia patients should consult a doctor for evaluation of their condition and treatment under the guidance of a physician.