Commonly known as Dry Eye, Computer Vision Syndrome, is a very common problem of most computer users due to prolonged usage. Here are some tips to avoid this and keep those eyes from getting irritated or dry.
Ideally, your computer monitor should be more than 25 inches from you eyes and 6 inches below eye level.
This will decrease the amount of light reflected on the screen and your eyes will thank you for that.
If you can, avoid sitting in a location with air blowing directly in your eyes from the A/C.
You should know this one by now. Every 20 minutes, look away for 20 seconds at something 20 feet away.
Blink frequently to keep the surface of your eyes moist.