Debating what is better for dry eye; drawing on white paper or digitally on a grey screen. Any advice?

I'm getting started for a comic project that will take me around 18 months, and I want to set myself up for the least bad experience with my dry eye, and am deciding whether it would be better for to spend 6 hours a day drawing on (and staring at) white paper, or a grey screen.

Any advice? Do you find that white paper or grey screens are better for your dry eye?