There are several reasons glasses may hurt. Your child probably needs to adjust to the glasses if they are new, so you may need to use words of encouragement, reminding them that it is normal and that they will soon feel normal. You can also make them wear the glasses as often as possible. Some glasses are not the right fit, so you may need to ensure the frames fit well and the glasses are well-adjusted. If the child still complains or experiences symptoms such as blurry eyes or headaches, you may need to schedule an appointment with the eye care specialist.