NEC PowerMate Professional 9000E Series User Manual page 216

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Position the monitor at a 90° angle to windows and other
light sources to minimize glare and reflections. Adjust the
monitor tilt so that ceiling lights do not reflect on your
screen.
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If reflected light makes it hard for you to see your screen,
use an anti-glare filter.
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Clean your monitor regularly. Use a lint-free, non-abrasive
cloth and a non-alcohol, neutral, non-abrasive cleaning
solution or glass cleaner to minimize dust.
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Adjust the monitor's brightness and contrast controls to
enhance readability.
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Use a document holder placed close to the screen.
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Position whatever you are looking at most of the time (the
screen or reference material) directly in front of you to
minimize turning your head while you are typing.
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Get regular eye check-ups.
A-10 Setting Up a Healthy Work Environment