TH: Using the computer

Recently I often use computer because I have to use for my homework. I think that computer is very convenient but if I use long time I feel tired. But I have to use. I worry about a thing. It is my eyesight. I use computer nearly everyday. I think is not good for my eye. So I don't want to use long time. So, every time I use computer taking break. But I often feel tired. But also I like using a computer because it is really useful. If I want to contact to teacher, I can sent Gmail. 101/9473