If a child has a visual acuity of 0.5 after a vision test, it is important to determine if the vision is normal based on the child’s age and then decide if glasses are needed. Because eye development is a gradual process, the best vision is not 1.0 for all age groups, and at the age of three, naked eye vision is normally 0.4-0.5. Therefore, if a child is three years old and has a naked eye vision of 0.5, this is normal vision and there is no need for glasses. However, if a child is over six years old and has a naked eye vision of 0.5, it means that the child’s eyes may have refractive errors, such as myopia, hyperopia or astigmatism, in this case, then actively conduct an optometry examination, and if there is indeed refractive error, then consider wearing glasses.