text: Also, this could be helpful to the children mentally and physically. Three out of four children and teens spend more than seven hours on their phone or watching television. These devises put out blue light into the the eye which is bad because, this can cause straining in the eye or even total blindness. when you are on your phone most of the time you have acess to the internet which means you can get on social media websites. When on websites like snapchat and instagram teens tend to compare their selves to others, and if they aren't up to par to look like "pretty" people they can get sad and form some type of depression.