To make it easier to see what’s on your iPhone screen, you can invert display colors, make transparent items solid, and modify how colors appear with color filters.
Tip: Quickly set brightness with the slider in > Accessibility > Display & Text Size.
Turn on Reduce Transparency.
Some screen items rely on color to convey information. You can replace these with alternative ways to tell them apart, like shapes or text.
Go to Settings Accessibility features for vision on iPhone