There are two main purposes of dilated pupils, one is for optometry and the other is to check the fundus. The purpose of dilated eye examinations is to get an accurate prescription, especially for farsighted patients, who can relax their ciliary muscles to get a more accurate prescription for their farsightedness. In addition, if you are examining the fundus, especially the peripheral fundus, you need to dilate the pupil so that you can see the peripheral fundus, especially the equatorial view, which often requires a dilated pupil to detect. Usually, there are two types of pupil dilatation: fast and slow, but for children who are farsighted, a slow dilatation may be needed for a permanent fundus examination, and slow dilatation medication may also be needed.