Never used this thing but as far as I understood you have to "move" your eyes in order to drag a window, or to click on something, or to do anything of the sort

Never used this thing but as far as I understood you have to "move" your eyes in order to drag a window, or to click on something, or to do anything of the sorts, while when I'm looking on a screen I generally read stuff (which doesn't involve that "much" of an eye movement) or watch a video (which doesn't involve eye movement almost at all).