The iPhone is full of wonderful affordances like this for low-vision folks.
My favorite option I've discovered is the magnifier. When it's on, you can triple-tap the home button to open the camera and turn the iPhone into a little hand lens, even if it's locked. The shutter button doesn't save the picture; it just freezes it (with some fancy optical stabilization) so you can pinch and zoom even further with your fingers. This is more convenient than swiping around on the lock screen to open the ordinary camera.
It's really helpful to read signs and restaurant menus. Settings -> General -> Accessibility -> Magnifier.
My favorite option I've discovered is the magnifier. When it's on, you can triple-tap the home button to open the camera and turn the iPhone into a little hand lens, even if it's locked. The shutter button doesn't save the picture; it just freezes it (with some fancy optical stabilization) so you can pinch and zoom even further with your fingers. This is more convenient than swiping around on the lock screen to open the ordinary camera.
It's really helpful to read signs and restaurant menus. Settings -> General -> Accessibility -> Magnifier.