Slow pupil dilation is more accurate than fast pupil dilation. However, because the difference between the two is smaller in older children and fast dilation is more convenient, fast dilation is used more often in older children. For children with refractive errors, a dilated pupil examination is needed to obtain an accurate refractive error, which can be divided into slow dilation and fast dilation of two ways, in which slow dilation of the use of atropine drops and other ciliary muscle paralyzing agents, can more fully paralyze the ciliary muscle and dilate the pupil, so as to obtain more accurate results of the optometric examination. However, slow pupil dilation is not as convenient as fast pupil dilation, and recovery is slower, with full recovery taking about 2 to 3 weeks after stopping the medication. Older children, generally defined as those over 12 years of age, do not have a significant difference between the two direct results, and therefore tend to adopt the fast pupil dilation method. It is recommended that refractive error patients hospital visits to assess the condition, under the guidance of the doctor to choose the appropriate way to dilate the pupil optometry.