One is the accuracy of the prescription, and the accuracy of the prescription comes from whether there is a standardized dilated eye exam. The younger the child, the stronger the adjustment, and the more false components may exist. Therefore, for children under the age of six, it is recommended to use atropine gel to dilate the pupil, go for an optometry on the fourth day, and come back three weeks later to see what the specific prescription is. For children between the ages of 6 and 12, you can choose the short-acting pupil dilator Safeguard, which lasts for three days, so come back three days after your eye exam. For children over the age of 12, you can use tropicamide, which is also a short-acting dilator that only lasts for six hours, so you can get the exact prescription the next day after your eye exam. Therefore, accurate prescription is the prerequisite for prescription, and after the prescription is accurate, we need to choose the right lens and frame, and the pupil distance should be accurate, these are the problems of lens prescription.