Looking at a visual acuity chart after dilating the pupils can lead to inaccurate vision test results. Although ciliary muscle paralysis does not affect distance vision, the dilation of the pupil can cause glare, which can affect the vision test. If you want to check your distance vision accurately, it is important to do so with normal pupil size. If the pupil is dilated and a near vision test is performed, the ciliary muscle is paralyzed and cannot be adjusted, resulting in the patient’s vision not being able to focus on the near vision chart, which can seriously affect the accuracy of the test results. Therefore, it is inaccurate to look at the visual acuity chart for both near and far vision examinations. As a matter of fact, the purpose of dilation is not to look at the visual acuity chart, but to check the standardized prescription and wear suitable glasses.