Buick 1993 Roadmaster Owner's Manual page 178

Night Vision
'No one can
see as we11 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 headlights, but they
also make a lot of things invisible that should remain
yisible
-
such as parked cars, obstacles, pedestrians, or
even train5 blocking railway crossings. You mzy want to
put on your sunglasses -after ,you have pulled into a
brightly-lighted service or refreshment area. Eyes
shie1ded.from that glare may adjust.more quickly to
darkne,ss back on the road. But be sure to remove your
sunglasses before you leave the service area.
When you .follow another vehicle on a freeway or
highday, use low beams. True, most vehic1e.s 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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