Most of my day contains activities that are done in front of a screen or which are hard on the eyes. The only activity I found that helps is taking a walk (but that's about 1h per day, still need 1-2 more hours of eye resting / time spent outside).
So, I come here asking, what do you do in your spare time, that's healthy for the eyes and other body parts :) ?
If you have a consistent pain or strain, I highly recommend going to an ophthalmologist and ask for exercises you have do.
It's a bit hard to find time for it during a workday, but sometimes I just have the urge to get moving and trade lunch with my colleagues for some time on the board. A really nice change of pace, and I can usually think much better after getting some movement in, even if it's just some light cruising.
I'd still like to have another hobby which I can do during the winter, and maybe even while commuting. Maybe I should take up something like knitting, or any other craft which can be done during short downtimes.
Focusing on a small ball that is coming from far away, all the way to you and back again, 100 times per game.
Lots of ball sports would be similar.
I also have an e-ink Android tablet and a Kindle so that I can do something that is not as eye-fatiguing.
Another tip that I picked-up from Hacker News, is to lower my monitor brightness to about 50 percent.
I also listen to a lot of podcasts, that is my wind-down ritual at the end of the day.