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Adjusting the brightness of your iPhone or iPod touch is easy to do and can serve a variety of functions. To adjust Brightness, tap the Settings icon, then select Brightness. Then adjust the Brightness Slider to your preferred level of illumination. If you're say in a darkened movie theater, you might want to turn the Brightness down to be less conspicuous. And don't forget to turn the Ringer off while you're at it. If you're outside on a sunny day, you'll want the Brightness to be higher to fight the power of the sun. Lowering the Brightness will also help save some battery power. Now, we also have the Auto-Brightness option. With Auto-Brightness On, your iPhone or iPod touch will sense the amount of light and adjust the screen Brightness accordingly.
The effectiveness of this function has been debated and many users don't seem to notice any significant change in Brightness when stepping from indoors to outdoors, so your results may vary. I actually use the Brightness Slider a lot myself, especially indoors at night. I find dragging the brightness nearly all the way down is a lot easier on my eyes, but you can play around with the levels on your own and find what works best for you.
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