The length of the eye axis of an 8.5-year-old girl reaches 23.8 millimeters, which is longer than that of children of the same age, and there is a possibility of myopia, so she needs to pay attention to protect her eyes and do more outdoor sports to prevent myopia from growing as much as possible. If you are already nearsighted, you can correct it by wearing eyeglasses. The length of the eye axis will be lengthened gradually with the age of infants after birth, usually about 16 millimeters at birth, and reaches about 24 millimeters at the age of 18. 8-year-old children’s eye axis length has reached 23.8 millimeters, close to 24 millimeters, which is higher than the normal value of children of the same age, suggesting that there is a possibility of axial myopia. Children should develop good eye habits, do more outdoor exercise, and minimize the use of electronic products such as cell phones, TVs, and computers to control the prolongation of the eye axis length and prevent myopia. If the optometry examination finds that they are already myopic, they should wear glasses in time to avoid further aggravation of myopia. It is recommended that children should go to the ophthalmology department of regular hospitals in a timely manner, complete the relevant examinations, and follow the doctor’s instructions for treatment after strict optometry.