Children need to cover one side of their glasses because they have monocular amblyopia and need to cover the dominant eye to exercise the amblyopic eye and make it see better.
Not all children need to cover one side of their eye when wearing glasses. Only children with monocular amblyopia need to cover one eye with an eye patch when wearing glasses, covering the eye that is developing normally without amblyopia, called the dominant eye.
Covering the dominant eye is an important means of treating amblyopia. By forcing the child to use the amblyopic eye to see, it exercises the amblyopic eye and stimulates the development of visual function in the amblyopic eye.
If vision loss occurs, one should consult the ophthalmology department of the hospital in a timely manner, and the doctor will identify the specific cause and then instruct the patient to undergo treatment.