If you are a long time computer user like me, you might have noticed the occasional hurts and discomforts that go hand in hand with spending long periods of time in front of the PC. Stare at a monitor for hours on end, year after year and most likely you'll eventually start to notice the pains magnify in frequency and severity. Do this long enough, and the discomfort could become part of the daily routine when you sit down to work or game at a computer.
This is especially noticeable when using a computer setup outside your home or office, where the mouse and keyboard, monitor and even the position you are sitting in are different. If you depend on your computer to make a living, these symptoms can present a major barrier to your ability to work effectively, and not just day-to-day.