Clinically, myopia can be assessed by determining the eye axis length or the mean corneal curvature radius ratio (axis ratio). The normal human eye axis is 23.5~24mm, and the corneal radius of curvature is 7.8mm. During the process of orthokeratology in both eyes, the corneal curvature has a compensatory effect on the growth of the eye axis length, i.e., the corneal curvature becomes smaller with the growth of the eye axis, to stop myopia. The main influence on the refractive status of the eye with age is the eye axis length, while corneal curvature plays a lesser role in the refractive status. A ratio of eye axis length to corneal radius of curvature greater than 3 is a risk factor for myopia. When the eye axis is too long or the corneal curvature is too small, it will lead to myopia, which requires further examination and determination of the type of myopia for timely correction. It is recommended that testing be done under the guidance of a medical professional.