When glare sources cannot be removed, seek appropriate screen treatments such as glare filters. Keep the screen clean. The chair is usually the most important piece of furniture that affects user comfort in the office. The chair should be adjusted for comfort, making sure the back is supported and that the seat pan is at a height so that the thighs are horizontal and feet are flat on the floor. An ergonomically sound chair requires four degrees of freedom - seat pan tilt, backrest angle, seat height, and backrest height.
Operators can then vary the chair adjustments according to the task.
In general, chairs with the most easily adjustable dimensions permit the most flexibility to support people's preferred sitting postures. Armrests on chairs are recommended for most office work except where they interfere with the task. Resting arms on armrests is a very effective way to reduce arm discomforts. Armrests should be sufficiently short and low to allow workers to get close enough to their work surfaces, especially for tasks that require fixed arm postures above the work surface. The work surface height should fit the task.