Apple Macintosh PowerBook 150 - Manual (Page 65)

Built-in display
m Adjust the angle of the display to minimize glare and reflections from
overhead lights and windows.
m If your display screen has manual brightness and contrast controls, you
may need to adjust the brightness and contrast of the screen when you take
the computer from one work location to another, or if the lighting in your
work area changes.
Avoiding fatigue
m Change your seated position, stand up, or stretch whenever you start to feel
tired. Frequent short breaks are helpful in reducing fatigue.
m Allow adequate workspace so that you can work comfortably. Place papers
or other items so you can view them easily while using your computer. A
document stand may make reading papers more comfortable.
m Eye muscles must work harder to focus on nearby objects. Occasionally
focus your eyes on a distant object, and blink often while you work.
m Clean your screen regularly. Keeping the screen clean helps reduce
unwanted reflections.
What about electromagnetic emissions?
There has been recent public discussion of the possible health effects of
prolonged exposure to extremely low frequency (ELF) and very low
frequency (VLF) electromagnetic fields. Such fields are associated with
electromagnetic sources such as television sets, electrical wiring, and some
household appliances—as well as computer monitors.
Apple has reviewed scientific reports and sought the counsel of government
regulatory agencies and respected health organizations. Based on the
prevailing evidence and opinions, Apple believes that the electric and
magnetic fields produced by computer monitors do not pose a health risk.
In response to those customers who wish to reduce their exposure to
electromagnetic fields, Apple has lowered the emission levels of our products.
We are also actively encouraging further scientific research so we can
continue to promote the health and safety of our customers and employees.
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