Degree 1.0, or eye sight 1.0, is normal vision, and there are no degrees. Visual acuity of 1.0 means that the patient can clearly see the symbols above the 1.0 line of the standard visual acuity chart when standing at a distance of 5 meters. The visual acuity chart is judged by the patient’s ability to see the direction of the symbol openings and how clearly he or she can see them. However, for farsighted patients, the farther away and the smaller the symbols, the clearer they can see them, so with a visual acuity of 1.0, they may also have 100-300 degrees of farsightedness, so visual acuity of 1.0 is not a decisive basis for the measurement of the degree of visual acuity. Patients are advised to go to a regular hospital for professional optometry to check the specific eye condition. If the patient does not have other diseases, visual acuity of 1.0 is normal vision, there is no degree.