OnePlus WC018A31KX - High Contrast Text

Go to Settings > System > Accessibility and
enable "Color inversion" to invert the display
colors.
Color correction
⚫ Deuteranomaly: red-green
⚫ Protanomaly: red-green
⚫ Tritanomaly: blue-yellow
High contrast text
Go to Settings > System > Accessibility > High
contrast text. Enable this function to increase
the contrast with background.