The time required for prescription lenses after pupil dilatation depends on the time taken to recover from the application of the medication. For example, if you use tropicamide eye drops to dilate your pupils, you can usually recover and wear the right glasses after one day, while if you use atropine eye drops to dilate your pupils, you can wear the right glasses for more than half a month. Medical optometry needs to operate according to the actual situation of the wearer, and the premise of scientific and healthy prescription is dilated pupils. Pupil dilatation refers to the dilatation of the pupil, which is used for optometry to measure the exact prescription and facilitate the fitting of appropriate glasses, and includes fast and slow dilatation. Fast pupil dilatation is suitable for adults, and the pupil can be dilated in a few minutes with the use of a fast-dilating drug, and can return to normal in about 4-5 hours. Slow dilatation is suitable for children, and it takes about 15 days to recover from the use of slow dilatation medication before you can consider prescription lenses. It is important to note that some people are not suitable for pupil dilatation, such as those diagnosed with primary angle-closure glaucoma, or those whose examination reveals a shallow anterior chamber, high intraocular pressure, or severe pupillary adhesions, which may cause some damage to the eye if the pupil is dilated.