Video displays units (VDU’) in work areas should be loacated so that no window or overhead ligh can create glare on the screen. If glare exists, it should if possible be eliminated by adjusting the ligh source, or at least reduced by instlaling a special cover on the screen. The VDU screen should be approximately three times brighter than the general room ligh around; it should be positioned at a comfortable height and the angle of viewing should be adjustable. Keep the screen, as well as any reference material you are using 350 or 500 millimeters away from your eyes. The keyboard and chair should be at comfortable heights; it is the table height, not the chiar height , that should be adjustable. Also, the chair should provide good back support. Lastly, to avoid possible headahces, eyestrain or blurred vision, take a break of up to 15 minutes after two hours of work.