Two and a half year old children with no reserve value for hyperopia, mostly means that the children have the possibility of developing myopia. Patients can prevent myopia by adjusting their eye habits, outdoor exercise and regular checkups. 1. Adjustment of eye habits: children need to avoid prolonged use of eyes in close proximity, control the time of reading books and watching TV in close proximity, and reduce the use of electronic products such as cell phones and computers to prevent myopia. 2. Outdoor exercise: Children need to pay attention to look into the distance and increase outdoor activity time, research found that outdoor exercise can prevent myopia to a certain extent. 3. Regular checkups: The lack of reserve for hyperopia suggests that the patient’s eyes will have a high possibility of myopia. It is recommended to go to the ophthalmology department for regular checkups of the optometry and the length of the eye axes, and to formulate appropriate measures according to the development of the situation. It is recommended that children with abnormal optometry should consult an ophthalmologist in time to evaluate their condition and follow the doctor’s instructions for treatment.