Normally, humans blink about 18 times a minute, but studies show we blink half as much while using computers and other digital screen devices, whether for work or play.
Extended reading, writing or other intensive “near work” can also cause eyestrain.
Now here's what you can do: Sit about 25 inches from the computer screen and position the screen so your eye gaze is slightly downward; Reduce glare from the screen by lighting the area properly; also use a screen filter if needed.
It may be a good idea to post a note that says “blink” on the computer as a reminder.
Every 20 minutes, shift your eyes to look at an object at least 20 feet away, for at least 20 seconds: the “20-20-20” rule.
Use artificial tears to refresh your eyes when they feel dry.
Take regular breaks from computer work, and try to get enough sleep at night.