EUROCOM 8500-C DeskNote User Manual page 12

Lighting
Proper lighting and comfortable display viewing angle can reduce the eye
strain and muscle fatigue in your neck and shoulders.
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Position the display to avoid glare or reflections from overhead lighting
or outside light sources.
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Keep the display screen clean and set the brightness and contrast to
levels that allow you to see the screen clearly.
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Position the display directly in front of you at a comfortable viewing
distance.
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Adjust the display-viewing angle to find the best position.
In addition, continuous concentration on computing work can result in
discomfort and injury. Remember to:
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Alter your posture frequently.
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Stretch and exercise your body several times a day.
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Take periodic breaks when you work at the computer for long periods of
time. Frequent and short breaks are of greater benefit than fewer and
longer breaks.