A child’s visual acuity of 4.9 may be due to factors such as pseudomyopia or true myopia, which can be corrected by changing eye habits or wearing eyeglasses. 1. Pseudomyopia: Pseudomyopia is caused by eye fatigue due to long-term eye use, and can be corrected by improving eye habits. Generally, the symptoms can be improved after improving eye habits. It is recommended to take proper rest, develop good reading and writing postures, and avoid using electronic products for a long period of time. 2. Genuine myopia: Genuine myopia is an organic change that is irreversible. As the visual acuity of 4.9 is mild myopia, it can be controlled by improving eye habits, etc. If the symptoms are still not improved or the visual acuity gradually decreases, you can consider going to the hospital for optometry, and correct it by wearing framed glasses under the guidance of the doctor. If the patient has symptoms of blurred vision, it is recommended to go to the hospital in time for a comprehensive eye examination to assess the condition and provide targeted treatment.