Visual acuity 4.6-4.7 can generally only indicate a decrease in vision, but bad vision is not necessarily due to myopia, but can be caused by farsightedness, astigmatism, and fundus lesions, etc. If bad vision is caused by myopia, there are some values for reference when glasses are needed. 4.6-4.7 vision can refer to the 5-point vision table, the normal visual acuity of the 5-point vision table is 5 points, the smaller the value, the worse the vision. 4.7 is generally Myopia is about 200 degrees, 4.6 is generally about 250 degrees. When the visual acuity is 4.5-5.0 range is caused by myopia, it is generally pseudomyopia or visual fatigue. It is necessary to go to a professional institution for examination first. When examining the eyes of adolescents, it is necessary to paralyze the ciliary muscle in order to be able to test the degree, mainly because the adolescent ciliary muscle is stronger in regulating function. Pseudomyopia can be treated with small concentrations of atropine or tropicamide, and can also be corrected by wearing glasses, not blindly by yourself, to avoid the development of true myopia. If the value reaches below 4.5, it is usually true myopia, and it is also necessary to go to a professional institution to wear the correct number of glasses to avoid deepening the degree. According to research, myopia is becoming more and more common among people of younger and younger ages, so it is increasingly important to prevent myopia, especially to avoid overuse of the eyes.