Dilated pupil usually refers to dilated optometry, while the measurement of the eye axis and its two completely different tests, the role is not the same, and there is no distinction between which is more accurate. Dilated pupil optometry is commonly used in children with refractive errors, and is mainly used to paralyze the ciliary muscles inside the eyeball, removing the interference of ciliary muscle regulation on the results of the optometry, so as to be able to get the most accurate refractive error, while ocular axial measurements are used to measure the diameter of the child’s eyeballs, so as to understand the development of their developmental status. The two tests are completely different and the results are not comparable, so it is not possible to say which of the two tests is more accurate. Under normal circumstances, the results of both tests are accurate and are two important indicators of the health of the child’s eyes.