Of course not, you should not read book on the kindle fire especially in the dark. When you have reading on kindle fire in the dark, your eyes have to be focus on the point, so this will make your eyes fell strain. In a long time, it will do harm to your eyes. Anyway, you should be careful about it. Besides, it all depends on your pose when you have reading. You should not read book in the bed. Also you should also pay more attention to your reading habits. For example, you'd better not read a book in a dark place. And the position and the distance of your reading are also very important, so just be careful about them. So that you can not damage your eyes.