Remember to blink naturally.
Prolonged computer use often means decreased frequency of blinking, which causes the eyes to dry out and feel sore. Normally, people blink about 22 times a minute. Computer users blink an average of about seven times a minute.

Place computer directly in front of you.

Keep computer screen 4 to 9 inches below eye level.

Adjust computer screen's brightness and contrast levels.

Use curtains, shades or blinds to control window lighting and glare.

Use an adjustable, or ergonomic, workstation that fits your body.

Get a thorough eye exam every year. If you wear glasses, make sure they meet the demands of the job. Talk to your optometrist about getting lenses for computer work. Before going to the eye doctor, measure the distance between your nose and your computer screen.

Take breaks every 20 minutes. Focus on something far away.

Place an adjustable copy holder at about the same distance from your eyes as your computer screen. This helps reduce head movement and focusing changes.

Clean your computer screen regularly. Dust and fingerprints reduce clarity.

Use eye drops especially created for computer eye strain.

Try This
Place a small mirror in front of your computer screen. Look for sources of glare, then eliminate them.

Use curtains or shades over the windows.

Move lamps. Reduce room lighting to half the normal office level. Try removing every other light bulb from overhead lighting. Incandescent lighting is better than fluorescent.

Try a glare- reduction filter that carries a seal of approval by the American Optometric Association.