Well, yes, it is normal to have blurry vision if you look at ipad screen for a long time. Generally speaking, when you look at ipad screen for a long time, it will just make your eyes focus on the small point. In a long time, it will just make your eyes have high eye pressure. In that way, your eyes will be stressed, leading to eye strain. And then, it can put stress on the eye muscles and the facial and scalp muscles, causing pain and headache, even red eyes, and blurred vision. So you should not look at the small screen for a long time, and it can be harmful for your eyes.