Apple Macintosh LC 575 - Manual (Page 16)

m Position your mouse at the same height as your keyboard.
Allow adequate space to use the mouse comfortably.
m Arrange the computer so the top of the screen is slightly
below your eye level when you’re sitting at the keyboard. The
best distance from your eyes to the screen is up to you,
although most people seem to prefer 18 to 28 inches (45 to
70 cm).
m Position the computer to minimize glare and reflections on
the screen from overhead lights and windows.
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 Use a light touch when typing or using a mouse and keep
your hands and fingers relaxed.
Some computer users may develop discomfort in their hands,
wrists, or arms after intensive work without breaks. If you
begin to develop chronic pain or discomfort in your hands,
wrists, or arms, consult a qualified health specialist.
10 Setting Up
Screen positioned to avoid reflected glare
Thighs horizontal
Shoulders relaxed
Forearms and hands in a straight line
Forearms level or tilted up slightly
Lower back supported
Feet flat on the floor
Clearance under work surface
45–70 cm (18–28 in.)
Top of the screen at or slightly below eye level
(You may need to adjust the height of your
computer by placing something under it or
by raising your work surface.)