Elevating a monitor using some thick books or tilting the monitor so that you can look at the first line of text at eye level can significantly reduce the risk of eyestrain, headaches, and neck and back pain. Changing the brightness of the screen, and dimming overly bright office lighting, can help too. Document holders that attach to your monitor and hold documents in front of you can reduce eyestrain and neck pain as well. Forearms and wrists should be parallel to a keyboard when typing. A keyboard drawer or an adjustable keyboard platform can go a long way to ensuring this ergonomically sound typing position.
Wrist rests .
These little wrist cushions can prevent carpal tunnel syndrome by keeping your wrist straight as you rest in between using the mouse. Note that your wrist should never rest on the cushion as you type or move the mouse, however. These help take the strain off your legs and back if your chair and desk are not of the appropriate height. Speaking as a small person, I assure you this works. In terms of costs, I don't know how workers' comp costs would compare to the cost of these fixes in the long term.