Visual acuity of 0.6 in a six-year-old child indicates that the child’s eyes may have certain diseases, such as refractive error or other congenital diseases. Slit lamp microscopy and corneal topography can be used to determine whether there are congenital organic fundus lesions and anterior segment lesions. If there is no obvious lesion, dilated optometry examination is needed. The more common causes such as refractive error, including myopia, hyperopia or astigmatism, etc., which can be improved by wearing glasses. If the vision is not relieved after wearing frames and is severely reduced, treatment such as corneal cross-linking surgery is needed depending on the cause. It is recommended that a six-year-old child with 0.6 visual acuity should go to the hospital in time, and standardized treatment should be carried out according to the doctor’s instruction after clarifying the cause of the disease.