A visual acuity of 4.9, although slightly below normal, is generally considered normal. Visual acuity of 4.9 is the visual acuity recorded by the five-point visual acuity recording method, which is equivalent to 0.8 in the decimal visual acuity recording method. It is generally recognized that the normal visual acuity for adults is 1.0 and above, and although 0.8 is lower than the visual acuity level of 1.0, it is usually considered normal. A patient with a visual acuity of 0.8 may have mild myopia or may have recently over-exerted his or her eyes causing eye muscle fatigue, resulting in a slight decrease in visual acuity. Visual acuity of 4.9 can be left alone if it does not interfere with normal life. If there is a higher visual acuity requirement, myopic patients can improve their vision by wearing glasses to correct myopia. It is recommended that patients with vision loss seek prompt medical attention to assess their condition and follow the doctor’s instructions for treatment.