Myopia examination is also called optometry, which is a very routine examination in ophthalmology. There are two types of examinations: the first is direct computerized optometry, which is relatively simple and inexpensive, usually about $25. However, this kind of examination is only suitable for adult optometry, or for people who need to replace their glasses for a long time. The second type is dilated optometry, which is mainly used for children’s vision examination, and the cost of this examination is about 100 yuan. The principle is to use a ciliary muscle paralyzing agent, which is a dilating drug to dilate the pupil, and then go to the computer for optometry, which can remove the eye’s own adjustment, thus truly reflecting the child’s refractive state, and the prescription of glasses will be more accurate.