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Environment Module > Lighting - 6 of 7
 
 


Glare Corrective Measures

Corrective measures can be taken in the workplace to reduce or eliminate Computer Vision Syndrome. Lighting changes can help reduce problems with glare. In general, less light is better for VDT use, as long as appropriate adjustable task lighting is provided. Some organizations have taken the opportunity to make these changes when implementing lighting modifications for energy savings.

  • Direct Glare - VDTs should not be placed in front of a window, so that the user is subjected to direct glare from the outdoors. Placing the VDT perpendicular to the window can help with direct glare, but window treatments such as blinds or drapes will probably still be required. Ceiling fixtures or any other lighting sources should not be in the user's field of view. This may require relocation of desks or repositioning of fixtures. Parabolic lens are best on overhead fluorescent fixtures, although this may not totally resolve direct glare or reflected glare. Indirect lighting fixtures are preferred with the light bounced off of the ceiling.
  • Reflected Glare - Sources of reflected glare can be seen and identified by viewing the display by users while they are seated in their normal VDT work position. White walls can be painted in muted colors with a matte, non-reflective surface. Desks tops as well should be muted, darker colors with matte finishes. Wall hangings and pictures that cause reflections can be reframed using non-reflective glass.
  • Veiling Glare - Indirect lighting and lower levels of general illumination should be used for ceiling lights and wall scones to help to control veiling glare. Newer lighting systems for VDT offices enable a user to control the lighting fixtures immediately overhead by remote control devices.
  • Lighting Levels - Indirect, ambient lighting should be in the range of 20 to 50 footcandles, if both computer and hard copy tasks are being performed. In this case task lighting adjustable up to 75 footcandles must be provided. Supplementary task lighting should be mobile--allowing the user to reposition to avoid glare--as well as adjustable in light level. If the only the VDT is being used then light levels of as low as 5 to 10 footcandles may be appropriate.
 
 

   

  
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