Visual acuity charts can not see the degree, but only the visual acuity. Visual acuity chart can only check the patient’s naked eye vision or corrected visual acuity, but not check the patient’s refractive error, the patient should correctly carry out the optometry examination to clarify the patient’s refractive status. There are many types of visual acuity charts, which can be categorized into C-type visual acuity charts, E-type visual acuity charts, and cartoon visual acuity charts. There are also more methods of recording visual acuity, such as the five-point visual acuity recording method and the decimal visual acuity recording method, such as 1.0 for the decimal visual acuity expression method of recording visual acuity, equivalent to 5.0 five-point visual acuity recording method of recording visual acuity. Normal adult naked eye visual acuity should be 5.0 or 1.0 or more, children’s eyeballs in the development stage, vision with the growth of age gradually develop normal. In general, you should develop good eye habits, do not overuse your eyes, and do not rub your eyes with dirty hands. Patients with abnormal vision are advised to consult a doctor promptly to assess their condition and follow the doctor’s instructions for treatment.