A visual acuity of 4.9 in a 10 year old child is already below normal, which is an abnormal phenomenon and is considered myopia. Usually, children around 10 years old have fully developed vision and can reach a normal visual acuity of 5.0. It is recommended to consult a doctor to find out the cause. 10-year-old children with visual acuity 4.9 lower than normal, considering that it may be caused by pseudomyopia, due to poor eye adjustment caused by functional myopia, due to the usual excessive use of the eyes, environmental factors affecting the cause. It has the symptoms of mild myopia, with blurred vision at a distance, but the degree of blurring is not stable, and self-conscious symptoms such as dizziness, eye swelling and eye pain may occur. The treatment of pseudomyopia focuses on giving the eyes sufficient rest and correcting their bad eye habits, without the need to wear eyeglasses. Daily attention to moderate eye use, avoid prolonged use of computers, cell phones, appropriate increase in outdoor time and other ways to adjust, so that the eyes have enough rest, adhere to a period of time after the vision can have some recovery.