Xiao Man is a 10-year-old elementary school student who is in the fourth grade this year. She has good character and academic performance, especially she plays piano well. She has participated in many piano competitions, and her best result was the second place in the city. However, recently, she found that she couldn’t see the blackboard clearly, and the piano practice was not very clear, she also asked her mother to help her copy into large size letters, but it was still blurred. So, her mother took her to the optician to get glasses. After the computerized optometry examination, she found that she had 350 degrees. According to the result of the optometry, she got the glasses. On the way back, she felt dizzy and uncomfortable walking. She also felt dizzy in class and had a headache and eye pain. After a week, Xiao Man refused to wear these glasses. She was very worried about her mother. This time, her mother brought her to the hospital for a checkup. The doctor gave her a rapid pupil dilatation with tropicamide every 5 minutes, three times, and then waited 20 minutes for the pupil to dilate completely before performing computerized optometry and apparent optometry, which showed that there were not as many as 350 degrees of myopia, but only 250 degrees. The optician’s prescription was a full 100 degrees more, so it’s no wonder she was uncomfortable with it. And the pupil distance of her glasses was not correct. It was determined based on the distance she could see near and far. After the prescription was made according to the doctor’s examination, Xiao Man was much more comfortable and could see clearly. She can go to school and play the piano happily again. Her mother said that she should not wear glasses casually, she must go to the hospital for examination and dilate her pupils before prescription, she must not wear them casually, they will damage her eyes.