You can’t tell if you need glasses just from your vision, you also need an optometrist. With a visual acuity of 0.5, if the optometry reveals a refractive error, glasses are needed. However, a visual acuity of 0.5 is normal for a 3~5 year old child and glasses are not needed. If the patient is under 3~5 years old, the vision is normal. As age increases, the eyes develop and mature, and the vision will naturally improve. If the patient is older than 5 years old, it is recommended to go to the hospital to check if the myopia is caused by refractive error. If refractive errors such as hyperopia, myopia, astigmatism, etc. are diagnosed, glasses are needed to correct them as soon as possible, or else myopia may worsen, affecting normal life and study. Patients are advised to seek medical advice in time to determine the cause of 0.5 visual acuity, and under the guidance of the doctor, to correct their vision through prescription of glasses and other measures.