How Sunglasses Can Protect Your Eyes

Certain medications also can increase the risk of photophobia, or light sensitivity, which can cause discomfort, the need to squint or close the eyes and headaches. Some of these drugs include belladonna, furosemide, quinine, tetracycline and doxycycline, Pierce says. “Even some over-the-counter pain relievers — notably ibuprofen and naproxen — have been shown to bring about painful light sensitivity as a side effect,” he notes. Sunglasses can help in these cases as well.

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How to protect your sight

The use of sunglasses may help to reduce the likelihood of damage, Wang says. But it depends on the pair you pick and how you wear them.

Eye-protection tips from the experts:

• Be a stickler for UV blocking. “When shopping for sunglasses, it's important to verify that they block out 99 to 100 percent of UVA and UVB rays and screen out 75 to 90 percent of visible light,” Pierce says. The label may indicate “100 percent protection against UVA and UVB” or “100 percent protection against UV 400,” which means that the glasses block rays as small as 400 nanometers.

• Consider the shape. “The best sunglasses are those that wrap around the face, as this blocks light from all sources and provides the most protection compared to flat-fronted sunglasses,” Wang says.

• Don't let the tint color fool you. The tint of the lenses doesn't determine the protection, Wang says. “Lighter-tinted glasses can still provide strong protection."

• Opt for “polarized." This type of lens reduces reflections off horizontal surfaces, such as water, snow and the hood of a car. “While polarization is not necessary to provide additional protection, it does reduce this source of eye strain,” Wang notes.

• Realize they're not just for sunny summer days. Experts suggest wearing sunglasses even on cloudy days.

Pierce says the sun's rays can actually be more harmful during the winter — especially at high altitudes and on reflective surfaces such as snow and ice.

Second, clouds don't offer full protection from the sun. “In partial sun or clouds, UV light still penetrates through and it's still a good idea to wear sunglasses,” Wang says.

• Go for quality, not necessarily brand name. Many people are willing to pay hundreds of dollars for a pair of designer sunglasses. Is that smart? “Often you are paying for the label and the look,” Wang says. “However, they are generally using higher-quality lenses as well.”

Lower-cost sunglasses often meet the minimum requirements, too, he says. “But you need to use more caution to ensure that the lenses do in fact meet the standards.” You can take any pair of sunglasses to an optometrist, who can test the lenses to be sure they provide the proper UV protection.

• Wear them over contacts. Some contact lenses offer UV protection, but they should still be worn with sunglasses to maximize eye protection, according to the AOA.

• Don't forget kids. “Wearing sunglasses early in life is particularly important because children often spend much more time outdoors than adults,” Wang says. “Sunglasses can have protective effects against damage occurring much later in life.”

• Go beyond sunglasses. “Applying sunscreen around the eyes and wearing a hat or visor in addition to sunglasses can help improve protection,” says Pierce.

• Avoid looking directly at the sun. You've heard this advice during eclipses, but it's true all the time. “If someone looks directly at the sun at any time without protection,” Wang says, “it can cause temporary or permanent damage to the retina.”