One of the biggest complaints I've heard from people who have made the upgrade to iOS 7 is that they can't read Apple's new favorite typeface -- Helvetica Neue Ultra Light. There's a simple way to make almost everything on your iOS device more readable, and that is to use the Accessibility settings to enable bold text. The result? Well, see for yourself. The image at top left is the "normal" text setting, while the one at right has bold text enabled.
Enabling this readability trick is quite easy: just use Settings > General > Accessibility and toggle Bold Text on. Your device will restart, and once that's done you'll be able to actually read text without straining your eyes.
Here's a video showing how to enable bold text in iOS 7 (note that you can go full-screen for full effect). Enjoy!