Apple Intel-based iMac (Mid 2007) - Manual (Page 60)

60 Chapter 5 Last, but Not Least
Avoid Hearing Damage
Understanding Ergonomics
Here are some tips for setting up a healthy work environment.
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 are 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, you should:
 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