Apple iMac G5 (iSight) - Manual (Page 63)

Appendix B Safety, Use, and Care Information 63
Avoid Hearing Damage
Ergonomics
Chair
An adjustable chair that provides firm, comfortable support is best. Adjust the height of
the chair so that 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.
Warning: Permanent hearing loss may occur if earbuds or headphones are used at
high volume. You can adapt over time to a higher volume of sound that may sound
normal but can be damaging to your hearing. If you experience ringing in your ears
or muffled speech, then stop listening and have your hearing checked. The louder the
volume, the less time required before your hearing can be affected. Hearing experts
suggest that to protect your hearing:
 Limit the amount of time you use earbuds or headphones at high volume
 Avoid turning up the volume to block out noisy surroundings
 Turn the volume down if you can’t hear people speaking to you
Thighs tilted slightly
Shoulders relaxed
Screen positioned to avoid
reflected glare
Forearms and hands
in a straight line
Forearms level
or tilted slightly
Lower back supported
Feet flat on the floor
or on a footrest
Top of the screen at or slightly below
eye level (You may need to adjust the
height of your display by raising or
lowering your work surface.)
Clearance under work surface
45–70 cm (18–28 in.)