As the title says, I am interested in hearing what other people on this forum do to preserve their eyesight from the effects of extended computer use. I am spending the majority of my waking hours staring at a screen. Between work, studies and entertainment (it doesn't help that my fun activities also include a computer or reading), I am doomed to be reading something on a screen somewhere. Lately I've been having a chain of 6h night's sleep, and that may be a factor too, but I am feeling the exhaustion in my eyes, and I don't want my eyesight to deteriorate any further (and God forbid, glasses!).
The first step I want to take is trying to prioritize getting 8h sleep in days when there are no external factors to prevent me from doing it. I think that will help with eye recovery and general energy levels. I've also been reading about techniques to improve eye vision or reduce the strain, apparently there is something called the 20 min rule, when every 20 min you take a break from the computer to stare at an object far away. I've set a timer and I look out the window when there are no people around it (there usually are), or just at the wall (alas, it's not that far from me). At home it's simpler, because I can stare at far off objects with impunity, but it's harder to do my stare breaks at work

I've also read about some other things that supposedly help, like staring to the side, or making circles with your eyes. I am doing that too, whenever I remember and..well, when there's no one around.
Lately I've also tried Flux, an app that dims your screen according to the time of day. From what I've heard, people are using it to dim the screen at night in order to reduce the blue light, and help with their sleep. There is a noticeable difference when the sun goes down and Flux kicks in, but I cannot say if it helps the eyes or not.
What are your thoughts on this? How do you keep your eyes in good shape with all the constant staring at a screen?