The normal value of the eye axis of a 7-year-old child is 21-22mm, and the eye axis of 23.96mm is higher than the normal value, but it is not possible to judge whether the child is myopic or not. Myopia is related to the length of the eye axis, corneal curvature and lens curvature and other factors, but the child needs to be examined by optometry to clarify the refractive status. Due to the differences in individual development, the corneal curvature and lens curvature of each person are somewhat different, and it is not possible to determine whether a child is myopic only by the length of the eye axis. Most children’s corneal curvature is basically stabilized at the age of 3, lens curvature is basically stabilized at the age of about 12, and the length of the eye axis is basically stabilized at the age of about 18. If a child is found to be myopic after an optometric examination, the child is suffering from myopia. Usually, children should take good care of their eyes, sit properly, do eye exercises at the right time, don’t read or write under dim lights, and look at more green plants, which is conducive to the protection of eyesight. Children with abnormal eye axes are advised to consult a doctor to evaluate their condition and follow the doctor’s instructions for treatment.