The computer monitor should be at or slightly below eye level, and elbows and legs should make a 90-degree angle with the body while the hands are on the keyboard. The seat should not be so long that it digs into the back of the legs, and the chair's height should be adjusted so that the feet can touch the floor without dangling, he said. To help improve posture, make a simple adjustment to the keyboard. Slip a board, about three-quarters to one inch thick, beneath the lowest side of the keyboard. Many experts also favor touch pads instead of the mouse or the trackball, which often promote unnatural gripping actions that can cause injury.
New devices are also available to attach the mouse or trackball to the keyboard to ease strain.
They could change the desk height, change the chair, use a foam wrist rest. But some experts believe that the use of wrist rests and splints may limit motion too much. They have to be able to remain supple. People end up alleviating some of the pain, but they tend to put added stress on some of the other muscle groups. You really want a range of motion.