A visual acuity of 4.8 is generally considered normal for children under 4 years of age, but is generally abnormal for adults. 1. Normal situation: for children who are not fully developed, a visual acuity of 4.8 is normal, because children usually do not develop visual acuity until after the age of five, when the visual acuity develops to 5.0. If you suspect that it is not normal, you can give your child a dilated pupil optometry examination, and if there is a refractive error, the patient can wear glasses to correct it. Usually the child should pay attention to not excessive eye use, control the use of electronic products time. 2. Abnormal situation: Visual acuity of 4.8 is abnormal for adults, because the normal visual acuity standard for adults is 5.0. If the patient has vision loss, the cause should be identified, such as nearsightedness, farsightedness, keratitis, cataracts, fundus disease, etc. can lead to the patient’s vision loss. Patients with abnormal vision are advised to seek prompt medical attention to assess their condition and follow the doctor’s instructions for treatment.