Employees may spend a considerable amount of time looking at the monitors. Screens should have user controls for character brightness. Screens that swivel horizontally and tilt or elevate vertically enable the operator to select the optimum-viewing angle.
Monitors placed too close or too far away may cause you to assume awkward body positions that can lead to eyestrain.
Viewing distances that are too long can cause you to lean forward and strain to see small text. This can fatigue the eyes and place stress on the torso because the backrest is no longer providing support.
Viewing distances that are too short may cause your eyes to work harder to focus (convergence problems) and may require you to sit in awkward postures. For instance, you may tilt your head backward or push your chair away from the screen, causing you to type with outstretched arms.
The preferred viewing distance from the front surface of the monitor to the user's eyes is 20-40 inches.
Viewing angle-height and side-to-side
Working with your head and neck turned to the side for a prolonged period loads neck muscles unevenly and increases fatigue and pain.
- Position your computer monitor directly in front of you, so your head, neck and torso face forward when viewing the screen. Monitors should not be farther than 35 degrees to the left or right.
- If you work primarily from printed material, place the monitor slightly to the side and keep the printed material directly in front. Keep printed materials and monitors as close as possible to each other. The screen and document holder should be the same distance from the eye to avoid constant changes in focus and close enough together so the operator can look from one to the other without excessive movement of the neck or back.
Monitor view time
Viewing the monitor for long periods of time can cause eye fatigue and dryness. Users often blink less while viewing the monitor.
Rest your eyes periodically by focusing on objects that are farther away (for example, a clock on a wall 20 feet away).
Stop, look away, and blink at regular intervals to moisten the eyes.
Alternate duties with other non-computer tasks such as filing, phone work, or customer interaction to provide periods of rest for the eyes.
Monitors that are tilted significantly either toward or away from the operator may distort objects on the screen, making them difficult to read. Also, when the monitor is tilted back, overhead lights may create glare on the screen. This can result in eyestrain and sitting in awkward postures to avoid eye glare. Dust accumulation associated with computer monitors and can reduce contrast and degrade viewing conditions.
- Tilt the monitor so it is perpendicular to your line of sight, usually by tilting the screen no more than 10 to 20 degrees. This is most easily done if the monitor has a riser/swivel stand. A temporary solution involves tilting the monitor back slightly by placing a book under the front edge. Note: Tilting the monitor back may create glare on the screen from ceiling lighting and a glare screen may be needed.
- Computer monitors should be periodically dusted and cleaned.