Yes, staring contests can be harm to your eyes. First, you should know that it can lead to eye strain by doing this contest in a long time. In other words, your eyes will be forced to work harder than they need to, therefore, straining them and that lead to eye strain. Finally, it can cause your eyes to develop problems such as short-sightedness. In some cases, it will make your eyes become dry. So you are not supposed to do this staring contest. Besides, looking some small print in a long time, or watching TV will also do harm to your eyes, so just be careful about them.