Apple LC 550 Specifications download pdf (Page 14)

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 than

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 office

Here are some guidelines for adjusting the furniture in your office

to accommodate your physical size and shape.

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.

n When you use the computer keyboard, your shoulders should

be relaxed. Your upper arm and forearm should form an

approximate right angle, with your wrist and hand in roughly

a straight line.

You may have to raise your chair so your forearms and hands

are at the proper angle to the keyboard. If this makes it

impossible to rest your feet flat on the floor, you can use a

footrest with adjustable height and tilt to make up for any gap

between the floor and your feet. Or you may lower the

desktop to eliminate the need for a footrest. Another option is

to use a desk with a keyboard tray that’s lower than the

regular work surface.

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Apple LC 550 Specifications Page 14