The development of the eye axis is a gradual process of refinement, and under normal circumstances children’s eye axes are shorter than those of normal adults before the age of eight. At the age of three, a child’s eye axis is usually around 20-21mm, at the age of six it can reach 22mm, and at the age of eight it develops into an adult state, reaching between 23-24mm. If the axes of the eyes are too long, it means that there may be myopia, and it is necessary to go to the hospital as soon as possible for an optometry examination to clarify the degree of myopia. If the degree of myopia is relatively large, resulting in a significant loss of vision, you need to wear glasses as soon as possible to improve your vision. In addition, once the axial growth occurs, it is an irreversible process and there is no way to normalize the axial growth.