A child with 0.5 vision is not necessarily nearsighted; if the child is nearsighted, it can be corrected. There are some differences in vision levels when children are at different ages. In general, less than 4 years old, visual acuity 0.5, is normal vision, is not considered myopia. This is because newborn children have small eyeballs and short eye axes, but as the child grows and develops, his or her vision will also develop, and the eyeballs and eye axes will gradually normalize. Therefore, a child aged 3 to 4 years old with a visual acuity of 0.5 is not considered myopic. If your child is older than 4 years old and has a visual acuity of 0.5, it is very likely that he/she is nearsighted or has an eye disease. It is recommended that he/she go to the ophthalmology department of a regular hospital for a detailed examination and a clear diagnosis. If myopia is diagnosed, it can be corrected, such as paying attention to eye hygiene, changing bad eye habits, reducing the use of electronic products and so on.