Generally speaking, a naked eye vision of 5.0 or better is the normal range of vision. Naked eye vision is the vision that allows you to see without glasses on a standardized vision chart. Naked eye vision of 5.0 is equivalent to international standard vision of 1.0. If you notice a decrease in vision or blurred vision, you should go to the hospital for an ophthalmology examination to determine if there is a refractive error or other pathology, and if there is, you need to follow the doctor’s advice and the results of the examination for the next step in the treatment. Naked eye vision of 5.0 is the normal range of vision, usually pay attention to maintain, in daily life should pay attention to eye time, control the distance of reading and watching electronic products, to reduce late at night, play games and other bad habits, go to the hospital on a regular basis for vision examination.