Samsung R530 User Manual page 22

Eye Position
Keep the monitor or LCD away from your eyes by at
least 50cm.
 Adjust the height of the monitor and the LCD screen so
that its top height is equal to or lower than your eyes.
 Avoid setting the monitor and LCD excessively bright.
 Keep the monitor and LCD screen clean.
 If you wear glasses, clean them before using the
computer.
 When entering contents printed on a paper into the
computer, use a static paper holder so that the height
of the paper is almost equal to that of the monitor.
Hand Position
Keep your arm at a right angle as shown by the
figure.
 Keep the line from your elbow to your hand straight.
 Do not place your palm over the keyboard while typing.
 Do not hold the mouse with excessive force.
 Do not press the keyboard, touchpad or mouse with
excessive force.
 It is recommended connecting an external keyboard
and mouse when using the computer for long periods
of time.