Samsung SyncMaster 723N User Manual page 10

Good Postures When Using the Monitor
When using the product, use it in the correct position.
Keep your back straight while looking at the product.
The distance between your eyes and the screen should be
between 45 to 50 cm. Look at the screen from a slightly higher
location than the height of the screen.
When using the product, use it in the correct position.
Adjust the angle so that light is not reflected on the screen.
Place your arms perpendicular to your sides and allow your
arms to be level with the back of the hand.
Keep your elbow at 90 degrees.
Keep your knees at greater than 90 degrees, and keep your
heels firmly on the floor. Keep your arms lower than your heart.