Under normal circumstances adults should have a visual acuity of 1.0 or more, so 1.0 vision is a normal vision. The eyes are an important visual organ, so you must take care of them in general, only then can you keep your eyes in a healthy state and maintain a clear world. Therefore, in ordinary life need to do a reasonable use of the eyes, the correct use of the eyes, such as the use of electronic products, generally recommended not more than four hours a day, each time the use of time do not exceed one hour in a row. Do not lie down to read, and do not read in a darker environment, or a brighter environment, these habits are not conducive to eye health. Normally, you need to increase outdoor time, which on the one hand can reduce the symptoms of eye fatigue, on the other hand, to avoid the occurrence of myopia.