If you're experiencing eye discomfort, might I recommend:
1. Setup your work area to have even lighting. Working in a dark room with only computer monitor(s) for light is going to give you eye strain.
2. Get up and walk around periodically. Let your eyes focus on something else and relax a bit.
3. If you need glasses, make sure they're the right prescription for sitting at a computer. Old farts like me should keep a reading glasses with the right prescription for 24" to 30" for looking at your monitors.