For me I use the accessibility shortcut, three presses of the side button pops up a menu so I can select color filters (grey scale) and reduce white point (80%

For me I use the accessibility shortcut, three presses of the side button pops up a menu so I can select color filters (grey scale) and reduce white point (80% is my default). I enable both when I am reading. It's really helped eye strain when I'm reading.