Nowadays, some adolescents’s smartphone is their daily essential, to bring and use all day. 20 th century is technology based, following that, usage of smart device is becoming trend and people are neglecting the down-sides of this issue. Firstly, we bring our smartphones to every place we go, even in our bed and lose our time sense while scrolling. Recent study shows, most of the electrical devices radiate that ray of lights, that is known as the blue-light. It’s harmful to our eyes and also when we’re under blue-light effect, the brain releases dopamine hormone. Hormone that creates addiction. This is the alarming reason of this case. In recent years, more and more people are going to opthalmologists, to get glasses. Because, under effect of the ultralights. Secondly, our life highly depends on our usage of smart devices, such as phones, computers and even smart watches. We know the disadvantages of them, but we tend to rely in our electronics. In my opinion, this deve...