Apple M9032LL User Guide - Page 87

 Arrange the display so that 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).  Position the display to minimize glare and reflections on the screen from overhead lights and nearby windows. If possible, use a tiltable display stand. The stand lets you set the display at the best angle for viewing, helping to reduce or eliminate glare from lighting sources you can't move. 45-70 cm (18-28 in.) Shoulders relaxed Forearms and hands in a straight line 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.) Forearms level or tilted slightly Lower back supported Screen positioned to avoid reflected glare Clearance under work surface Thighs tilted slightly Feet flat on the floor or on a footrest For more information about health, safety, and maintenance, go to the Apple ergonomic website at www.apple.com/about/ergonomics. Avoid Hearing Damage 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 Appendix B Safety, Maintenance, and Ergonomics 87