As we get older, the eye axis grows gradually. It is generally believed that when a person is born, the length of the eye axis is generally around 16.5-17.5mm, and by the time a person is 1-2 years old the eye axis can develop to 21mm, by the time a person is 3 years old the eye axis can generally be around 22mm, by the time a person is 7-8 years old the eye axis is almost between 22.8-23mm, and generally the eye axis of an adult will remain at approximately 23-23.5mm, which is the normal eye axis change. If there are abnormal changes in the growth of the eye axis, for example, if the growth rate is too fast and exceeds the normal age range, it may lead to myopia and requires early intervention. It is important to maintain reasonable eye habits and control the growth rate of the eye axis in order to prevent myopia from growing too fast.