The use of computers amongst office workers has increased markedly over the past two decades. This has resulted in an increase in health disorders associated with computer use, the most common of which are eye and vision problems. While eye health problems related to computer use are usually temporary, they cause significant discomfort to computer users and are largely preventable.

Specific impact of poor lighting across industries can be significant.

• It be a safety hazard - misjudgement of the position, shape or speed of an object can lead to accidents and injury.
• It can affect the quality of work, specifically in situation where precision is required, and overall productivity.
• It can be a health hazard - too much or too little light strains eyes and may cause eye discomfort (burning, etc.) and headaches.

How do you test and correct for insufficient light problems?

To detect insufficient light, try the following:

• Measure the average illumination throughout the workplace. Compare this to the recommended levels.
• Look for shadows, especially over work areas and on stairways.
• Ask workers if they suffer from eye strain or squint to see.

How much light is needed for various situations or activities?

The amount of light we need varies and depends on:

• Type of task being done (such as demands for speed and accuracy).
• Type of surfaces (does it reflect or absorb light).
• General work area.
• Individual's vision.

The amount of light falling on a surface is measured in units called lux. Depending on the factors noted above, adequate general lighting is usually between 500 and 1000 lux when measured 76 cm (30 inches) above the floor.*



Examples of industrial and office tasks and the recommended light levels are in the table below.