Night
Vision
No
one can see as well at night as in the daytime. But as
we get older these differences increase.
A
SO-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.
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.
High
Beams
If the vehicle approaching you has its high beams on,
signal by flicking yours to high and then back
to
low
beam. This is the usual signal to lower the headlight
beams. If the other driver still doesn’t lower the beams,
resist the temptation to put your high beams on. This
only makes two half-blinded drivers.
On a freeway, use your high beams only in remote areas
where you won’t impair approaching drivers. In some
places, like cities, using high beams is illegal.
When you follow another vehicle on a freeway or
highway, use low beams. True, most vehicles now have
day-night mirrors that enable the driver to reduce glare.
But outside mirrors are not of this type and high beams
from behind can bother the driver ahead.
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