Apple gives you an option on iOS to adjust Display Zoom on select iOS devices. It makes text more easier to read, and increases home screen icon sizes.

With auto-lock, you can set the length of time your iPhone can sit idle before it locks itself and turns the display off. Head to Settings > Display & Brightness > Auto-Lock and to choose a time ...

Set your iPhone screen to grayscale in accessibility settings to reduce eye strain, limit distractions, and even curb screen time habits.