A visual acuity of 0.5 generally means a naked eye vision of 0.5, which is not normal.
A naked eye vision of 1.0 is generally considered normal. Naked eye vision is primarily the vision obtained from a vision test performed without glasses. Some people have very good eyesight and can see at 1.2, 1.5, or even 2.0. The higher the value, the better the subject’s naked eye vision.
Some refractive errors may also cause a decrease in naked eye vision, but if the naked eye vision of both eyes is above 0.8, and will not affect the general learning and life, you do not need to wear glasses; however, if astigmatism, farsightedness, or nearsightedness causes a decrease in naked eye vision, you need to wear glasses to correct your vision.
In addition, it is recommended that patients with a visual acuity of 0.5 go to the hospital in a timely manner to clarify the cause of the disease and follow the doctor’s instructions for treatment.