Children’s eyes are highly adjustable. If the eye test is not performed without dilation, there may be a deviation in the reading due to over-adjustment, resulting in inaccurate results, which may affect the assessment and treatment of the child’s condition. The purpose of pupil dilation is to relax the ciliary muscle in the eye, and the eye can only be measured accurately when the adjustment is relaxed. In addition, pupil dilation can also identify pseudomyopia and true myopia, pseudomyopia patients do not need glasses. Therefore, children’s optometry, dilation is more necessary, the specific way of dilation should be determined under the guidance of the doctor. It is recommended that children in need of optometry should consult a doctor in a timely manner to assess their condition and follow the doctor’s instructions for examination and treatment.