Keep an eye out
Many vision and stress problems can be alleviated by making changes in the work environment. Follow the following suggestions for optimum computer positioning.
ALBERTON –
* Make sure the terminal is not placed in such a way that the operator sees only the screen or the wall behind the screen.
* Look well beyond the screen out into space every few minutes.
* Computer screens should be slightly below eye level (about 20 degrees). Copy or documents being read should be at the same level as the screen.
* The screen should be positioned 50 to 60cm from the operator’s eyes.
* Locate the keyboard in a position so that the wrist and lower arm are parallel to the floor.
* Chairs should provide proper back and leg support and be height adjustable.
* Adjust the chair height so that feet are flat on the floor or rest on a foot support with thighs parallel to the floor.
Office equipment technology is constantly being improved and where possible, advantage should be taken of new products which make for more comfortable operation.
Lighting is a vital factor
One of the main causes of complaints from computer operators is glare. This can occur as a result of reflections from the surfaces of the computer screen and from high contrast between the text, screen and surroundings. The ideal is to have even, comfortable illumination.
Consider the following:
* Lighting in the work environment where computers are used should be as indirect as possible.
* Fluorescent ceiling lights should be fitted with diffusers. If at all possible, lighting should be beamed upwards to diffuse against the ceiling.
* Computer workstations should be provided with adjustable shaded copy lamps that can be moved by the operator to avoid screen glare.
* Match as closely as possible the brightness of surroundings with that of the computer screen for optimum comfort and efficiency. However, the contrast between the characters on the screen and the screen background should be high.
* Minimise reflected glare in computer screens by having them positioned away from windows and other sources of bright light. Use window shades, vertical blinds and curtains to block out excessive sunlight.
* Adjust the computer contrast and brightness to achieve the most comfortable viewing level. These adjustments may need to be made at different times during the day if the work environment is influenced by altering levels of daylight.
* Anti-glare screens are available.
Maintenance
Regular maintenance of computers is essential to avoid, for example, a reduction in brightness, contrast and legibility.
Diminished screen image clarity will lead to significant eye strain and operator stress.
For the best operator performance and efficiency:
* Look up and away from the computer every few minutes.
* Take frequent short breaks.
* Have a comprehensive optometric examination annually.
* Make sure your optometrist knows about your current computer use.
Older computers in particular, tend to require regular focus and alignment resetting to ensure visual sharpness and avoid flickering and movement of the display.
