A patient with an eye axis of more than 24mm is not necessarily myopic. The normal length of the eye axis is 22-24mm. Myopia caused by the growth of the eye axis is called axial myopia, which is a decrease in naked eye vision due to the focus formed by the refractive system in front of the retina as a result of the growth of the eye axis. However, other factors such as corneal curvature and the refractive index of the lens determine the refractive power of the eye, and it is not possible to determine whether a patient is myopic simply by the length of the eye axis. Therefore, a patient with an axial length of more than 24mm may not necessarily be myopic, and the results of a computerized optometric test are generally needed to determine whether myopia has been caused by the computerized optometric test. It is recommended that myopic patients develop good eye habits, reduce the time of continuous close-up use of the eyes, and look at fewer electronic products, so as to avoid the progression of myopia and the development of high myopia.