Samsung SyncMaster 2280HD User Manual page 10

height so that the top of the monitor is slightly below eye level.
Adjust the monitor angle so that there is no reflected light on the
screen.Try to maintain your arms perpendicular to your armpits.
Keep your arms level with the back of your hands.
Keep the angle of the elbow perpendicular.
Keep the angle of the knees at more than 90 degree. Do not let
your feet fall up from the floor. Adjust the arm position so that it
is below the heart.