My favorite app on the iPad is Fluidity. Fluidity is a great app for my students with CVI. The app was free when I downloaded it, however there is a version that you can pay $.99 for and it adds sound. This app has the ability to replace some of the reasons you use a light box with multiply impaired children. It is highly interesting for kids. Any small movement will change the screen and create high contrast light and dark images. A favorite option in the menu is to turn on the sparkle. It works and looks great in a dark room.