Early correction of amblyopic children can have a very good therapeutic effect, in which masking training is easy to operate on a daily basis and children are more compliant, so it is chosen by many parents as a means of amblyopia treatment for their children. However, many parents may not know that there is a certain amount of care in the selection of eye shields for cover-up training. Covering training for amblyopic children means covering the eye with normal vision and forcing the amblyopic eye to look at objects in order to get exercise. There are three main types of eye shields available: the first: eye patches. Because it is directly applied to the skin around the eyelid, the masking effect is good, and it is more effective for children who are too young to cooperate fully with the eye patch treatment for amblyopia. However, eye patches also have certain disadvantages, as they are applied directly to the skin around the eyelids and can easily cause skin allergies and conjunctivitis, so they should be used with caution for children with allergies. The second type of eye patch is an eye-cloth mask. It can be placed on the child’s lens, and can be chosen from cartoon type cover-ups or graphic patterns that the child likes more to increase the child’s motivation and convenience. The disadvantage is that the effect is not as good as the eye patch, because the eye cloth is placed on the child’s lens, the child can peek up and down from the lens, which does not play a cover effect and affects the effect of amblyopia treatment, so it is prudent to use for children who are not conscious. The third type: Bangerter suppression film. For school-age children, wearing eye cloths to cover the eye patch will cause ridicule from classmates, parents can choose Bangerter suppression film for their children. This kind of suppression film looks not much different from ordinary glasses from the appearance, doctors can turn the suppression film into 0.1, 0.4, 0.5 vision, so for school-age children and children who resist the eye cloth covering eye patch, this kind of suppression film is not a good way to treat amblyopia.