As myopia increases, patients can feel that their vision is becoming blurry, but they are unaware that the eye axis (the length of the front and back of the eye) has quietly become longer. The blurred vision is caused by the deepening of the prescription, and the deepening of the prescription is caused by the growth of the eye axis, and the growth of the eye axis is the root cause of the deterioration of the eye. So here is an additional point of knowledge, a more important concern than myopia, and that is the length of the eye axis. Some myopia is less than six hundred degrees but the length of the eye axis is more than six hundred degrees of myopia, and there are pathological changes in the fundus of the eye that are associated with high myopia, but the diagnosis is still high myopia. The longer the eye axis is, the larger the balloon is blown up, and the larger the balloon is blown up, the thinner the corresponding balloon wall becomes and the more likely it is to be damaged. The eyeball will also become longer to a certain extent, and the possibility of lesions will increase greatly. Therefore, myopia only determines how good or bad the vision is after lens removal, but the length of the eye is the key indicator to determine whether the eye is healthy or not. In general, an eye axis below 26mm (the length of the eye axis corresponding to six hundred degrees under normal conditions) has no significant growth compared to the normal eye axis, so there are no obvious pathologic changes in the fundus of the eye. However, an eye axis higher than 26mm is no longer a simple myopia problem. The longer the axis of the eye, the thinner and more fragile the retina will be, and the more obvious the changes in the fundus will be, resulting in a leopard-shaped highly myopic fundus or even the commonly heard retinal detachment, and a series of complications such as glaucoma, vitreous clouding, macular degeneration (the most important part of the human eye), and even blindness. This series of changes cannot be changed by myopia surgery, so the only way is to do everything possible to control or slow down the progression of myopia. It is recommended that when you come to the hospital for a checkup, it is best to have your child’s eye axis measured, as this is the only way to have a comprehensive and detailed understanding of your child’s eye condition, rather than just knowing the degree of myopia. This test has several benefits: First, it can measure the curvature of the cornea (curvature of the cornea) and the length of the eye axis, through these two data you can know whether the child is curvilinear myopia or axial myopia, relatively speaking curvilinear myopia is better, because this kind of myopia eye axis becomes relatively small, the fundus changes are smaller. Secondly, parents are very concerned about their children’s astigmatism, and this test can accurately measure the size of astigmatism. Third, many parents want to wait for their children to grow up and have myopia surgery, so the question arises: can they still have myopia surgery when they grow up? The decisive parameter for myopia surgery is the corneal thickness. This test can accurately measure the thickness of the patient’s cornea and then calculate the maximum myopia that the patient can do.