Children with 300 degrees of myopia, wearing glasses to see near blurred, clear distance, may be caused by the glasses prescription is not suitable. Generally speaking, if the glasses are appropriate, the patient will be able to see things clearly both near and far. At this time, it is very likely that the optometry is inaccurate, and the child wears glasses with higher prescription, which leads to the phenomenon that the child can not see the near things clearly. Because children’s eyes have strong adjustment, if the pupil is not dilated during the optometry, the degree of myopia detected will be higher, which may affect the prescription of glasses and lead to discomfort after the child wears the glasses. It is recommended that children with myopia seek medical attention to evaluate their condition and follow the doctor’s instructions for treatment.