Visual acuity of 4.9 at age six is slightly below normal but within acceptable limits. Normally, the visual acuity of an eight-year-old child should be 5.0 or above to be considered normal. A visual acuity of 4.9 at the age of six is slightly below normal but within the acceptable range. It may be caused by refractive error, relative delay in eye development or intraocular disorders, etc. Pathologic causes should be ruled out promptly. In addition, children should go to the ophthalmology department of the hospital for appropriate examinations to rule out ocular pathology when abnormal vision is detected. Children should use their eyes correctly, reduce the use of electronic products, and ensure adequate rest to protect their eyesight. It is recommended that children with visual abnormalities seek medical attention to evaluate their condition and follow the doctor’s instructions for treatment.