Buick 1993 Century Owner's Manual page 158

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 afkct 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
hced
with severe glare (as from a driver who doesn't lower th
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 i n t o
your lane. Once you are past the bright lights, give your
eyes time to readjust before resuming speed.
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