Myopia in one eye can be corrected in a 12 year old child, and the common ways to correct it are: wearing framed glasses, contact lenses, or through surgery in adulthood.
If a 12-year-old child is nearsighted in only one eye, he or she needs to have an eye dilated optometry examination as soon as possible to clarify the specific degree of nearsightedness. If the difference between the two eyes is not large, they can wear frames to correct it. If the difference between the two eyes is too large, you can choose to wear contact lenses in the myopic eye to correct your vision.
For 12-year-old children with monocular myopia, surgical treatment for myopia cannot be done yet because the eyes of children at this age are still developing, and surgical correction can be done when the child becomes an adult.
In conclusion, monocular myopia in 12 year olds can be corrected by practicing good eye habits in daily life.