The reason for a follow-up examination the day after dilation is to understand the refractive state of the eye under normal pupils and to prepare for the prescription of glasses. The purpose of dilating the pupil before the eye examination is to relax the eye muscles so that the true refractive state of the eye can be obtained. The reason for reviewing the eyes the day after dilation is to understand the refractive state under normal pupils and to prepare for the fitting of glasses. Through the pupil dilation and undilated optometry, you can clearly understand the eye’s ability to regulate, which is more meaningful for the later prescription of glasses. Whether dilated optometry or undilated optometry need to go to the regular hospital ophthalmology to find a professional doctor to operate, the operation of the standard can only get the accurate value, so that you can match a suitable glasses.