Acer TravelMate P253-M User Manual page 14

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Avoid adjusting your display to an awkward viewing angle.
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Avoid looking at bright light sources for extended periods of time.
Developing good work habits
The following work habits make computer use more relaxing and productive:
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Take short breaks regularly and often.
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Perform some stretching exercises.
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Breathe fresh air as often as possible.
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Exercise regularly and maintain a healthy body.
Warning! We do not recommend using the computer on a couch or
bed. If this is unavoidable, work for only short periods, take breaks
regularly, and do some stretching exercises.
Note: For more information, please refer to "Regulations and safety
notices" on page 62.