Acer Aspire ELD User Manual page 10

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Task Lighting. When room lighting is dimmed, there may
be insufficient light on documents or reference materials for
comfortable reading. A well-lit room or a few directional,
adjustable task lights will allow you to see your monitor
screen and other materials clearly, and with the least
amount of strain.
Hand and Wrist. Keep your wrists straight and your
forearms parallel to the floor while you are typing. If you use
a wrist rest, use it only briefly for resting. Do not rest your
hands on the table or on the wrist rest while you are typing.
During long periods of typing, frequent breaks are
recommended.