For readability you want big text and max contrast. The black text on white background will make the eyes focus more, and might explain why some people feel eye

For readability you want big text and max contrast. The black text on white background will make the eyes focus more, and might explain why some people feel eye strain. Also the black sucks up the light in the room. You can use colors (both text and background) to draw attention, instead of text contrast suggested in modern guides. Remember to always design for content and readability first!