Honda Civic Owner's Manual page 147

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Expanded View Driver's Mirror
Outer Segment
Inner Segment
The driver side door mirror has outer and inner
segments.
The outer segment is slightly curved to provide
a wider angle view than a standard flat mirror.
This wider view may help you check areas that
are not visible using a standard door mirror.
uuAdjusting the MirrorsuPower Door Mirrors
1Expanded View Driver's Mirror
Objects visible in the outer segment of the driver side
door mirror appear smaller than objects in the rest of
the mirror. But in fact, they are closer than they
appear.
Do not rely on your mirrors. Always look to the side
and behind your vehicle before changing lanes.
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