Watching TV may cause myopia. There are two main causes of myopia, the first one is congenital genetic factors, and the second one is acquired bad eye habits. Because the reading distance of TV is usually short, if you watch TV unreasonably, such as watching TV for a particularly long time every day, more than 2 hours or even 3 hours, and watching TV at too close a distance, such as within 4 meters. This situation will put the eyes in a state of fatigue, and after a long time it may lead to myopia, especially in children, because the eyes of children are still developing. So in order to avoid the appearance of myopia, usually must try to reduce the time to watch TV, watch TV to maintain a reasonable reading distance, generally requires at least 4 meters. Only then can the eyes be in a relatively comfortable state and not prone to myopia.