What else in the computerized office contributes to the eye discomfort?

Other examples of work-related risk factors that contribute to eye discomfort are:

• maintaining a fixed and close visual distance for a long time,
• glare from the unshaded or un-diffused lighting fixtures,
• poor lighting, involving unchanged (and unchangeable) levels of illumination,
• unsuitable workstations (dimensions and arrangement),
• low ambient humidity,
• uncorrected vision problems, and
• lack of colour variety in one's surroundings.

Are there any non-visual effects of poor lighting?

When people are exposed to glare or have uncorrected vision problems, they tend to lean forward or backward in an attempt to compensate. An awkward body position leads to eye strain and accelerates postural fatigue that, in turn, contributes to musculoskeletal injuries (MSI).

How can eye discomfort be reduced?

Overhead lighting

• Use filters to diffuse overhead lighting.
• Dim overhead lights.
• Keep in mind that recommended level of light in offices 300 - 500 lux is not a must. It applies in the situation where there is no task lamp in use.

Windows and walls

• Cover windows with adjustable blinds.
• Use matte finishes on walls, floors and furniture.

Monitor

• Adjust the brightness and contrast according to your preference.
• Use a light colour for the background.
• Place the monitor parallel (not directly below) overhead lights.
• Angle the monitor away from lights and windows.
• Make sure that the task lamp illuminates the document and not the monitor.

Should anti-glare screens be used?

In general, anything between the operator and screen compromises the quality of the image. It is far better to control glare by proper lighting design and placement of the monitor than by use of an anti-glare screen. Many monitors currently available are already equipped with low reflective screens.

What can you do to reduce eye strain?

The ability to focus on objects at various distances decreases with age (presbyopia). Commonly, by their forties people cannot clearly see objects at close range with the naked eye. This is a gradual change, and has to be regarded as an important component in designing visual environments, particularly when the job involves computer work.

Uncorrected vision may be an additional source of eye discomfort. It may have further consequences resulting in aches and pains because of awkward postures or positions adopted to "see better".

Check your vision every one or two years, as recommended by your eye specialist.

Provide your eye examiner with information about your job.

Consider using task-specific computer glasses.

Depending on the amount of time you work at a keyboard, the kind of vision correction needed, and your personal preferences, your eye specialist may recommend bifocals, trifocals or even a separate pair of glasses for computer work.

Focusing your eyes on objects at the same distance and angle for prolonged periods of time can contribute to eye strain.

Every few minutes look away from the screen for a few seconds.

Look around.

Focus your vision on distant objects.

Blink several times.

Frequently "stretching" your eyes like this will prevent feelings of fatigue from accumulating.

Thanks to the Canadian Centre of Occupational Health and Safety