1, too little time for outdoor activities Nowadays, living space is too small, most of the time children are in indoor activities, a lot of time for close eye use, and children’s eyes are very adaptable, it will adjust to adapt to the close distance. Moreover, more time in the house, the opportunity to watch TV, play computer also increased, if you do not pay attention to the distance, posture, it is easy to make the eyes overworked. 2, mainly indoor games Outdoor activities, the eyes will automatically adjust to see things at different distances, alternating between near and far eyes, so that the ciliary muscle of the eyes are regulated, will not feel fatigue. Nowadays, most parents let their children play at home for reasons of safety and convenience. Even if the children play together, either at his home or at your home, or mainly indoor games. In this way, the child are in close proximity to the eyes, the eye burden is very heavy. 3, the light is not strong enough “light is bright enough? I worry that the lights are too dark will affect the child’s eyesight.” We generally think so. In fact, ophthalmologists believe that the lights of children reading and writing now are not too dark, but too bright. Too much light will make the child’s eyes easily feel fatigued. What children need is soft light, and make sure that the light comes from the child’s left front. Therefore, at night when children read and write, you can choose a lamp that can adjust the brightness and darkness, and adjust the brightness to soft prevail.