Rays from the sun, called ultraviolet light, can damage the eyes. Wearing the right kind of sunglasses outdoors may reduce the risk of eye damage from ultraviolet light.
Ultraviolet (UV) light from the sun may help cause:
Most modern sunglasses provide good protection against UV. The more ultraviolet rays are blocked, the more the eyes are protected.
Polarized lenses reduce glare reflected from surfaces such as water or snow. However, they don't block UV light unless they are combined with a coating that blocks UV. Mirror coatings alone do not provide UV protection and should be combined with a UV-blocking coating.
Photochromic lenses are almost clear in low light and turn darkly tinted in bright light. They react to UV light and not to visible light. A car windshield blocks out most UV light, which means that photochromic lenses will not darken in the car. Ask your eye care provider about tint options.
Wide-brimmed hats may keep about 50% of UV rays from reaching the eyes, but your child should also wear sunglasses. Sunglasses are very important if your child: