When you take your child for an eye exam, you will often encounter a choice between fast dilatation or slow dilatation in order to clarify whether you are nearsighted, and many parents often have many concerns, which are actually not necessary. This is just two different examination methods, the purpose is to clarify the child’s refractive state and further examination and diagnosis, fast dispersal is generally required to order fast dispersant several times the same day, the pupil is fully dilated after examination, generally 6-8 hours the pupil will return to normal, while slow dispersal is generally used long-acting pupil dispersant such as atropine, point eye 3 days in a row, 3 times a day, the pupil is dilated after examination, generally about 3 weeks In terms of its effectiveness, slow dilatation can fully paralyze the ciliary muscle and better reflect the patient’s true refractive state through examination. It is often used for children under 14 years of age, because children’s eyes are highly regulated and require strong dilating agents to fully relax their eyes, but many parents and children have difficulty accepting fast dilatation because of blurred vision and photophobia for up to three weeks after dilatation. From a doctor’s point of view, it is best to have a slow dilatation if the child is under 14 years old and is having his or her first refractive exam.