Normal 5 and a half year old child’s visual acuity range should be between 0.8 ~ 1.0, visual acuity 0.5 is more serious, may be the existence of refractive error or amblyopia. 1. Refractive error: 5 and a half year old children refractive error will lead to vision loss, you can dilate the child, optometry to get an accurate refractive error, clear whether there is true myopia and other conditions, and then wear glasses, vision will gradually return to normal. 2. Amblyopia: wearing glasses can not improve the degree of amblyopia may exist, then you can choose to cover the healthy eye method or visual function training, in order to gradually improve the visual acuity. Usually give the child good eye care, more green plants, more eye exercises, as little as possible to see electronic products, such as cell phones, computer screens, etc., sit properly. 5 years old child vision 0.5, take the child to the hospital in time, clear cause active treatment, so as not to lead to aggravation of the condition.