An eye axis of 27mm is not myopic, probably because the corneal curvature is very small, thus offsetting the myopia caused by the long eye axis. Myopia can be divided into two conditions, axial myopia and curvilinear myopia, and the vast majority of people have axial myopia. The degree of myopia is related to the length of the eye axis. When a person is first born, the eye axis is relatively short and the eye is in a farsighted state, and as it grows older, the eye axis gradually develops to normal, with a normal length of about 24mm. However, after the eye axis reaches its normal length, it grows further, which in turn leads to axial myopia. The reason for this is that parallel light rays are refracted through the eye and focused in front of the retina, thus making it difficult to see far away. In pathological myopia, the length of the eye axis increases, sometimes up to 28 or 29 mm, but the patient does not experience difficulty seeing far away, probably because the patient has a very small corneal curvature that offsets the refractive error caused by the increased eye axis. However, as the eye axis lengthens, it causes the retina at the back of the eye to thin, and this change in physiology predisposes to retinal detachment or retinal fissures, in addition to a range of fundus pathologies, such as leopard-like fundus changes and lattice-like degeneration of the retinal periphery. Therefore, patients need to go to the hospital for regular checkups at this time, even if they are not nearsighted.