Make sure that the VDT is aligned for your eyes and body at your work station. The VDT should be in directly in front of you and at an angle of about 10 to 20 below the level of your eyes in order to keep the head and neck muscles relaxed. People who wear bifocals or progressive no-line glasses may have different viewing distances. Eliminate any potential light sources that might produce shadows or glare on the screen. An anti-reflective screen filter placed on the VDT is very useful.
Many people also benefit from an anti-reflective coating and appropriate tint on their glasses.
The background illumination of the screen should be adjusted to a moderate level to avoid producing unnecessary eye fatigue. Finally, pay attention to your work area environment. High room temperature, low humidity, smokers, smog, excessive ambient noise levels, etc., may all cause a decrease in productivity and an increase in ocular fatigue. Artificial tears may also be useful even for those who do not wear CLs.