Eyes are windows of the heart, which means eyes are very important to us. But more and more students wear glasses nowadays, according to my opinion, there are a few factors we must pay attention to in our lives. firstly, we should not spend much time on electric devices, like cell phones, watch TV, play games on the computer, because Blu-ray is bad for our eyes and very harmful. after we had studied for a half hour or an hour, we'd better listen to music or look far into the distance. secondly, on weekends, we should do more exercise, like play Pingpong, baskets, football, cycling, swimming, etc. more exercise is good for children's health and bodies. Finally, we could eat more green vegetables and fresh fruits and keep a happy mood every day.