What is “dilated optometry”? It is a medical term for ciliary muscle paralysis optometry, commonly known as pupil dilation optometry. The eye adjustment of children is very strong, so it is easy to make errors without dilating the pupil, and dilated optometry eliminates the eye adjustment by using a ciliary muscle paralyzing agent, so that the true refraction of the eye can be obtained and the right glasses can be fitted. Is astigmatism harmful to my eyes? Dilated eye examinations require the pupil to be dilated only superficially. The essence of dilated eye examinations is to completely relax the ciliary muscle and loosen the adjustment to get the true refractive state of the eye. Many parents think that dilated pupils can harm their child’s vision, so they have many concerns and even refuse to dilate their child’s pupils. In fact, dilated pupils are a temporary effect of the medication, and the effect on children is only temporal. After the pupil is dilated, the child will experience temporary photophobia and difficulty seeing close to the eye, which will return after a period of time. The effect of dilated pupils paralyzes the ciliary muscles of the eye and dilates the pupil, which can lead to photophobia and blurred vision. Rapid dilators wear off in 6 to 8 hours and the pupil returns to its original state. Slow dilators, i.e. atropine, may take 2 to 4 weeks to wear off. A small number of patients using atropine for pupil dilatation may experience symptoms such as redness, dry mouth, dizziness, and panic. Dilated pupils are contraindicated in people with glaucoma or a tendency to elevated intraocular pressure. In children, dilated eye examinations are performed when the ciliary muscle of the eye is completely paralyzed by the application of medication, rendering it unregulated. The main reason for this is that adolescents’ eyes are highly regulated, and if the pupils are not dilated, the regulatory myopia component, known as pseudomyopia, cannot be removed and the accuracy of the results is affected. For adults, there are two purposes for dilating the pupil. First, therapeutic pupil dilatation: The main purpose of pupil dilatation for inflammation of the eye is to prevent post-iris adhesions and to relieve the spasm of the iris and ciliary body caused by inflammatory stimuli in order to reduce local inflammation. Second, screening pupil dilatation: dilate the pupil to examine in detail for undefined fundus lesions, refractive interstitial clouding, ocular trauma, etc.