Sunglasses are not just for movie stars and Secret Service agents. They're for anyone who spends enough time outdoors to get a suntan or even a sunburn. And they should be worn not only in summertime, but during winter as well.

People who are most vulnerable are those who spend a great deal of time in the sun, live near the equator or at high altitudes, have had cataract surgery, or take photosensitizing medications. If you're not in a high-risk category, you don't have to buy expensive sunglasses from an optician. Although drugstore or department store shades are of lesser quality, they will do fine.

Any sunglasses are better than none at all, but some types are better suited to certain activities. The goal is to block out the greatest amount of UVA and UVB rays. Here are some guidelines:

» Size: Choose lenses large enough to shield the eyes on all sides. Or buy wraparounds .

» Lens: Plastic lenses are lighter and safer than glass, but are less scratch-resistant. Mirrored lenses

» Gradient glasses, darker at the top and lighter at the bottom, are best suited for driving.

» Color: Gray and green lenses are best for drivers and pedestrians, who need to see traffic lights; amber for skiers, boaters and pilots, who need to see contrast.