I follow the 20-20-20 rule: Every 20 minutes, I look 20 feet away for 20 seconds to reduce eye strain.
Since I test applications for more than 8 hours a day, this really helps!
Another habit I follow is using dark mode to reduce eye strain. How about you? What methods do you use to protect your eyes during long screen time?
I think something people often neglect is having the right monitor set up. The top of the monitor should generally be just below eye level (depending on the size of the monitor), and the brightness should match the ambient light in the room, so you aren’t dazzled. I also play around with the contrast and sharpness, so they’re at a comfortable level, combined with the brightness.
Aside from that, I have everything big 
I can spot when a thing is off by two pixels, but I can’t read text when it’s too small, so I just have everything bigger to avoid constantly squinting and hunching to get closer.
All that being said, I probably don’t blink or look away enough 
To avoid straining your eyes when you’re continuously working, follow the 20-20-20 rule. After 20 minutes of work, look at something 20 feet away, then spend 20 years in the forest ©
I try not to stay long time in the computer. I’m not drinking coffee anymore, so I don’t have the “coffee stop” 
, but I try to stand up and drink water, watch the landscapes for 5 minutes before came back.
I don’t exactly follow the time, but yeah taking continuous breaks is crucial not only for eyes but also for maintaining focus.
Most of the time I put my laptop in sleep mode and go for a walk, talk to any team member, have a coffee break, or play foosball or any other game at the workplace.
Depending on the break duration I prefer any of these options, e.g. if I have a long break of 30 minutes then I would prefer a coffee break or go for a walk but if it is of short duration then I would prefer something on the floor itself.
I am in front of monitors for about 13 hours per day.
I won’t reduce it exclusively to work as there’s so many devices around: smartphone, tablets, home computer/tv, work devices, gps devices, watches/trackers, e-readers.
Besides eyes, the body posture during screen time matters as well, sometimes even more.
Some things that come to mind when I try to deal with it: standing desks, newer & larger monitors with filters and better color accuracy, using a monitor calibration device to adjust based in room ambient light, monitor angle and height, distance from monitor, desk seating position, looking at objects far away as much as possible, going for a walk, exercising, taking vitamins (A for eyes), for those with glasses (anti reflecting lenses, clean the glasses often), lubricate the eyes, split the day in half (take a longer lunch break outside of the office without devices), blue filters, lower light on the device.
High quality monitor and regular breaks help a lot.
I also tend to work early during the day while there is plenty of natural light in the room.
I use f.lux because the blue light kills my eyes.
I’ve also invested in a good over head lamp that uses LED light that doesn’t flash. BenQ has a great option: Swing Arm Adjustable Desk Lamp: E-reading Intelligent | BenQ US
I used to use glare filters on CRT monitors, even repurposing those to use on some LCD monitors (can’t adjust proper brightness & contrast that won’t irritate my eyes).
And for that I’ve found Apple displays/Macs, and Macbooks have one of the best display screens that I won’t get irritated with for eyes. For other PC based brands, it’s a hit or miss trial and error after using some for some extended time to know if you get affected or not.
Recently used blue light filtering tinting on my prescription glasses and I think those help as well.
Also took nap breaks to refresh the eyes and brain after working for some time on the computer 2-4+ hours, where I nap in my car parked at work.