A visual acuity of 4.6 is probably about 100 degrees of nearsightedness, but of course it could be a high degree of farsightedness, or a certain amount of astigmatism. Generally, it is a loss of vision due to myopia. If the visual acuity is only 4.6, among small children, it is necessary to wear glasses. And this glasses need to be worn all day long, except for washing face, bathing and sleeping. Otherwise, firstly, it will affect the study of reading the blackboard, and secondly, it may cause the myopia to deepen. If you are an adult, you can choose to wear glasses according to your needs. If you can see things with both eyes to meet your daily needs, you can not wear glasses. If it is driving or watching movies and other long-distance viewing, vision is not enough, you can get a pair of glasses and wear them when needed.