HP Compaq Presario,Presario 1700 Reference Manual page 117

12-12 Safety and Comfort
Tilting the Monitor
Tilt the monitor so that it faces your eyes. In general, the monitor screen and your
face should be parallel to each other. To check for correct monitor tilt, have
someone hold a small mirror in the center of the viewing area. When sitting in your
normal work posture, you should be able to see your eyes in the mirror.
Eye Height
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Your eye height will change considerably whether you use a reclining or upright
posture, or some posture in between. Remember to adjust your monitor's height and
tilt each time your eye height changes as you move through your comfort zone.
If you look at the monitor more than you look at paper documents, avoid placing your
AVOID!
monitor to the side.
Adjusting Monitor Height for Bifocal and Trifocal Users
If you wear bifocals or trifocals, it's especially important to properly adjust your
monitor height. Avoid tilting your head back to view the screen through the lower
portion of your glasses; this could lead to muscle fatigue in your neck and back.
Instead, try lowering your monitor. You may want to consider using monofocal
glasses that are specially made for computer use.
Notebook Viewing
Whenever using a notebook computer for long periods, you may find it more
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comfortable to connect a full-size monitor. A separate monitor gives you a wider
range of viewing distance and height options.
Adjusting Brightness and Contrast
Reduce the potential for eye discomfort by using brightness and contrast controls on
your monitor to improve the quality of text and graphics.
WRONG!
If you wear bifocals or trifocals, don't position
your monitor so high that you have to tilt your
head back to view the screen.