Amblyopia masking is the most classic treatment for amblyopia and has been used for more than 200 years. The principle of masking is determined by the age of onset and the severity of amblyopia. It is generally believed that if the child is relatively young, such as within one year of age, the duration of masking should not be too long, and it is recommended that a vision check be performed every week to prevent the formation of masking amblyopia. If the child is two years old, it should be reviewed once every two weeks, and after the age of four, it can be reviewed once a month. If the amblyopia is more serious, for example, the amblyopic vision is only 0.1 or even lower, you can put the masking time as long as possible, for example, every seven days a week, mask five days, put two days, and then adjust the treatment plan at any time according to the recovery of vision. Therefore, the treatment of amblyopia masking must be under the guidance of a doctor, and the most reasonable plan should be made according to the specific situation of the child.