Night Blindness is an important in vision that makes a person unable to see well, if at all, in dim light. It can mean something is wrong not only with the eyes but with the entire system. Night blindness is a threat to safety, particularly on the highway, because a driver may have 20/20 vision and not realize that he has night blindness. This condition also causes no observable changes in the tissues of the eyes, so it can't be diagnosed unless the patient tells his eye doctor that he can't read road signs at night or has trouble picking out objects on a dimly lighted street. It is not normal to have trouble seeing in dim light after a two- or three-minute period of adjustment. If you do detect such a condition in your vision, discuss it with an eye specialist. It can be treated temporarily by the addition of special vitamins to your diet.

If you are in the bright sun, dark glasses can protect your eyes-good sunglasses, that is. Poor ones can add to your troubles, especially if you wear them for a long time, and so can glasses that fit so badly you see the rims. Don't wear glasses with irregularities or scratches in them: plastic lenses scratch very easily. Some glasses are too lightly tinted to do any good. Unfortunately, good sunglasses are expensive. Don't look directly into the sun even though you are wearing glasses, and don't wear them indoors and at night-even though some Hollywood stars consider it smart! If you wear glasses, it is worthwhile to have a pair of sunglasses ground to your prescription, rather than clip a pair of possibly inferior sunglasses over your carefully made regular glasses.

Movies can cause eyestrain if the lighting is poor, the film flickery, or you sit too far to the side-or if you're such an addict that you go practically every day. It is easy to become addicted to television without realizing it, and this, too, can cause eyestrain. Television wont bother your eyes unless you have a room totally dark, sit too close or at an angle, or watch too steadily for a long time. I think it is wise to be arbitrary about children watching television, and set the limit at an hour, with a good long rest period before the next program. It is best, too, to mark a spot about six feet away from the set, because children are apt to sit practically next to the screen.