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Your Driving and the Road
Night Vision
No one can see as well at night as in the
daytime. But as we get older these
differences increase.
A
50-year-old
driver may require at least twice as
much light to see the same thing at night
as a 20-year-old.
What you do in the daytime can also
affect your night vision. For example, if
you spend the day
in
bright sunshine
you are wise to wear sunglasses. Your
eyes will have less trouble adjusting to
night.
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But if you're driving, don't wear
sunglasses at night. They may cut down
on glare from headlights, but they also
make a lot of things invisible
that should
remain visible
-
such as parked cars,
obstacles, pedestrians, or even trains
blocking railway crossings. You may
want to put on your sunglasses after you
have pulled into a brightly-lighted
service or refreshment area. Eyes
shielded from that glare may adjust
more quickly to darkness back on the
road. But be sure to remove your
sunglasses before you leave the service
area.
You can be temporarily blinded by
approaching lights. It can take a second
or
two, or even several seconds, for
your eyes to readjust
to the
dark. When
you are faced with severe glare (as from
a driver who doesn't lower the high
beams, or a vehicle with misaimed
headlights), slow down a little. Avoid
staring directly into the approaching
lights. If there is a line of opposing
traffic, make occasional glances over the
line of headlights to make certain that
one of the vehicles isn't starting to move
into your lane. Once you are past the
bright lights, give your eyes time to
readjust before resuming speed.
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