Open Settings
Tap Accessibility
Tap Display & Text Size
Turn on Reduce White Point
Adjust the slider to the lowest comfortable level
Open Settings
Tap Accessibility
Tap Zoom
Turn on Zoom
Set the Zoom Region to Full Screen Zoom
Triple-tap with three fingers to open the Zoom menu
Lower the Zoom Level if needed
Open Settings
Tap Accessibility
Tap Display & Text Size
Turn on Increase Contrast if helpful
Open Control Center
Drag the brightness slider all the way down
Turn on Dark Mode in Settings
Tap Display & Brightness
Select Dark
Turn on Night Shift in Settings
Tap Display & Brightness
Tap Night Shift
Set it to the warmest setting
Use Low Power Mode in Settings
Tap Battery
Turn on Low Power Mode
Enable Auto-Brightness in Settings
Tap Accessibility
Tap Display & Text Size
Turn on Auto-Brightness
Lower brightness in a dark room for the dimmest result
Use a matte or privacy screen protector to reduce perceived brightness
Reduce screen white areas by using dark wallpapers and dark app themes
Use Guided Access with reduced brightness settings if needed