It is not possible to determine whether glasses are needed simply from visual acuity, as vision develops continuously from birth, and a normal visual acuity of 0.5-0.8 at 3-5 years of age is considered normal. If the patient belongs to this age group, there is no large astigmatism, no myopia, and no hyperopia beyond the physiological range, glasses can be dispensed with, and the patient can be observed and followed up. If the patient is older than 5 years old and has a visual acuity of less than 0.5 or 0.5, medical optometry is needed to clarify whether it is myopia, astigmatism or hyperopia, and glasses are needed for either type of refractive error. If you are nearsighted, your nearsightedness will increase faster without glasses than with glasses. Astigmatism will also tend to create unclear and blurred vision, accelerating the eye’s progression toward myopia. There are also farsightedness, if you do not have glasses, at this age to see the distance is not clear, to see the near is even more unclear, over time it is easy to form visual fatigue.