Many people are not aware of the accessibility features available on the iPhone. They are useful for just about anyone. Here are a couple of examples:
Your iPhone has a built in magnifier that lets you quickly magnify anything. Enable the option in Settings > General > Accessibility. Then, Magnifier. Once enabled, triple-click the side button to start the Magnifier. It helps you read labels; instructions or view interesting objects in more detail.
Another feature is Speak Screen. This option allows you to swipe down with two fingers to have the content of the screen read to you. Increase or decrease the reading speed to your desired taste.