Well, yes, small screen can be bad for your eyes. According to some researches, the small screen, such as the cell phone, will just do a harm job to your eyes. First, you should know that when you are reading something in the small screen, it will make you to focus on the small prints carefully. In a long time, it will just lead to some eye strain. When you suffer eye strain in your eyes, it will just lead to many other eyes diseases, such as red eyes, bloodshot eyes, even dry eyes. In some cases, it also affects your sight. So you should not read something in small screen.