I. Why children need to dilate their pupils before they can get glasses The size of the adjustment force is closely related to age, and adolescence is the period when the adjustment force of the human eye is most vigorous. Why do children under 15 years old need to have their pupils dilated before they can be fitted with glasses? Since the eyes of adolescents under 15 years old have very strong regulation, they must have their pupils dilated before optometry. Adjustment means that the human eye increases the curvature of the lens to increase the refractive power of the eye in order to see the close pressure away from the object, so that the near object can form a clear image on the retina. Third, how long do glasses need to be replaced after wearing The replacement cycle of glasses is not absolutely fixed, and should be based on the changes in refraction and the use of lenses to decide whether to replace glasses. Generally speaking, children should review their vision once every 3-6 months, and adults should review their vision once a year, and then decide whether to replace the lenses according to the optometrist’s results. Can children with amblyopia be cured? Different types of amblyopia have different effects on visual development, and the treatment effect is also different. The younger the age, the higher the cure rate. The younger the child, the higher the cure rate. The faster the visual acuity improves; form deprivation amblyopia, such as congenital cataract, severe ptosis, etc., occurs in the early 2 months after birth, the patient can not establish a normal fixation reflex, the formation of perceptual nystagmus, the most serious degree of amblyopia, amblyopia treatment effect is poor. When a child can’t see a distant target, the child often takes the squinting approach to compensate, because the eyelids can block part of the pupil when squinting, reducing diffuse light and reducing the impact of astigmatism, thus temporarily increasing and improving visual acuity. If you find that your child is squinting a lot, you should be alert to refractive errors such as myopia, hyperopia or astigmatism, and should take your child to the hospital promptly. Six, children with delayed vision development often have to be treated Children with delayed vision are divided into two types: one exists refractive error, to be adequately and timely corrected, to wear appropriate glasses. The corrected visual acuity can be normalized to restore the visual function of both eyes; if the corrected visual acuity cannot be normalized, it should be treated according to the conventional method of amblyopia. Another kind of children who do not have refractive error can be temporarily left untreated and have a regular face light. The purpose of dilated pupils is to remove the ciliary muscle from adjustment and fully expose the refractive power of the eye, which is an essential step before optometry and the best way to let the ciliary muscle rest. After dilating the pupil, more light enters the eye and the child is afraid of light, so it is important to avoid light after the pupil is dilated and wait until the pupil returns to normal and the symptoms disappear. Therefore, the pupil is not harmful to the eyes. After the pupil is dilated, the ciliary muscle is temporarily paralyzed and the adjustment is relaxed, so when you look at something near, you can’t use the adjustment, so it’s not clear.