No one can see as well at night as in the daytime. Butas we get older these differences increase. A50-year-old driver may require at least twice as muchlight to see the same thing at night as a 20-year-old.What you do in the daytime can also affect yournight vision. For example, if you spend the day in brightsunshine you are wise to wear sunglasses. Youreyes will have less trouble adjusting to night. But if youare driving, do not wear sunglasses at night. Theymay cut down on glare from headlamps, but they alsomake a lot of things invisible.You can be temporarily blinded by approachingheadlamps. It can take a second or two, or even severalseconds, for your eyes to re-adjust to the dark. Whenyou are faced with severe glare, as from a driverwho does not lower the high beams, or a vehicle withmisaimed headlamps, slow down a little. Avoidstaring directly into the approaching headlamps.Keep the windshield and all the glass on your vehicleclean — inside and out. Glare at night is mademuch worse by dirt on the glass. Even the inside of theglass can build up a film caused by dust. Dirty glassmakes lights dazzle and flash more than cleanglass would, making the pupils of your eyes contractrepeatedly.Remember that the headlamps light up far less of aroadway when you are in a turn or curve. Keepyour eyes moving; that way, it is easier to pick out dimlylighted objects. Just as the headlamps should bechecked regularly for proper aim, so should your eyesbe examined regularly. Some drivers suffer fromnight blindness — the inability to see in dimlight — and are not even aware of it.4-19
