1998 Chevrolet Venture Owner's Manual - Page 270

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 leasttwice as much light tosee 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. Butif you're driving, don't wear sunglasses at night. They may cut down on glare from headlamps, but they also makea lot of things invisible. You can be temporarily blinded byapproaching headlamps. 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 highbeams, or a vehicle with misaimed headlamps), slow down a little. Avoid staring directly into the approaching headlamps. Keep your windshield and all the glass on your vehicle clean -- inside and out.Glare at nightis made much worse by dirt on the glass. Even the inside of the glass 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; thatway, it's easier to pick out dimly lighted objects. Just as your headlamps should be checked regularly for proper aim, so should youreyes be examined regularly. Some drivers sufferfrom night blindness -- the inability tosee in dim light -- and aren't even aware of it. 4-17