Apple PowerBook (Duo 270C) - Manual (Page 38)

This section offers advice on setting up your work area to
enhance your comfort while you use your computer. Since the
effects of repetitive movements associated with using a computer
can be compounded by those of other work and leisure activities
to produce or aggravate physical problems, proper use of your
computer system must be considered as just one element of a
healthy lifestyle.
No one, of course, can guarantee that you won’t have problems
even when you follow the most expert advice on using computer
equipment. You should always check with a qualified health
specialist if muscle, joint, or eye problems occur.
Eye fatigue
Eye fatigue can occur whenever the eyes are focused on a nearby
object for a long time. This problem occurs because the eye
muscles must work harder to view an object that’s closer that
about 20 feet (6 meters). Improper lighting can hasten the
development of eye fatigue. Although eye fatigue is annoying,
there’s no evidence that it leads to permanent damage.
Whenever you’re engaged in an activity that involves close-up
work—such as reading a magazine, doing craft work, or using a
computer—be sure to have sufficient glare-free lighting and give
your eyes frequent rest breaks by looking up and focusing on
distant objects. Remember to have your eyes examined regularly.
To prevent discomfort and eye fatigue:
n
Arrange your work space so that the furniture is properly
adjusted for you and doesn’t contribute to an awkward
working posture.
n
Take frequent short breaks to give your muscles and eyes a
chance to rest.
Arranging your work area and equipment
The suggestions in this section can help you work more
comfortably with your computer.
Chair
n
An adjustable chair that provides firm, comfortable support is
best. Adjust the height of the chair so your thighs are
horizontal and your feet flat on the floor.
The back of the chair should support your lower back (lumbar
region). Follow the manufacturer’s instructions for adjusting
the backrest to fit your body properly.
22 Chapter 1: Setting Up Your PowerBook Duo