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.
But
if
you’re
driving, don’t wear sunglasses at night. They may cut
down on glare from headlamps, but they also make
a
lot
of
things
invisible.
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 rnisaimed headlamps),
slow down
a
little. Avoid staring directly
into
the
approaching headlamm.
Keep your windshield and all the glass
on
your vehicle
clean
--
inside and out. Glare at night is made much
worse
by
dirt
on the glass. Even
the
inside
of
the
glws
can build
up
a film caused by dust.
Dirty
glass
makes
lights dazzle and flash more than clean glass would,
making
the pupils of your eyes contract repeatedly.
Remember that your headlamps light
up
far
less of a
roadway when you are in a turn
or
curve. Keep
your
eyes moving; that way, it’s easier to pick out dimly
lighted objects. Just as your headlamps should be
checked regularly
for
proper
aim,
so should your eyes
be
examined regularly. Some drivers suffer
frsm
night
blindness
-- the inability to see in dim light
--
and
aren’t even aware
of
it.
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