Magnificent, by Moblica, is a fanstastic, free magnifier app for both ipads and iphones. It magnifies up to 6 times, or for £2.29 you can upgrade and it magnifies by 16 times. You can freeze the frame to capture something on the screen which stays when you move the camera away.
“The main developer of this app is visually impaired, and therefore understands the needs of people with low vision. This is an indispensable tool that you will use every day.”