White / green, blue / black, are the hardest combinations to read due to distribution of cone cells in the retina (though fine if it is light blue / black, or d

White / green, blue / black, are the hardest combinations to read due to distribution of cone cells in the retina (though fine if it is light blue / black, or dark green / white). This is compounded even more by pentile on certain Apple phones once they moved to OLED.