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 asmuch light to see the same thing at night as a20-year-old.What you do in the daytime can also affect yournight vision. For example, if you spend theday in bright sunshine you are wise to wearsunglasses. Your eyes will have less troubleadjusting to night. But if you are driving, do notwear sunglasses at night. They may cut down onglare from headlamps, but they also make alot of things invisible.You can be temporarily blinded by approachingheadlamps. It can take a second or two, oreven several seconds, for your eyes to re-adjustto the dark. When you are faced with severe glare,as from a driver who does not lower the highbeams, or a vehicle with misaimed headlamps,slow down a little. Avoid staring directly intothe approaching headlamps.Keep the windshield and all the glass on yourvehicle clean — inside and out. Glare at night ismade much worse by dirt on the glass. Eventhe inside of the glass can build up a film causedby dust. Dirty glass makes lights dazzle andflash more than clean glass would, making thepupils of your eyes contract repeatedly.Remember that the headlamps light up far less of aroadway when you are in a turn or curve. Keep youreyes moving; that way, it is easier to pick out dimlylighted objects. Just as the headlamps should bechecked regularly for proper aim, so should youreyes be examined regularly. Some drivers sufferfrom night blindness — the inability to see in dimlight — and are not even aware of it.334
