Why wear sunglasses?
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.
What eye problems are related to exposure to sunlight?
Ultraviolet (UV) light from the sun may help cause:
- cataracts. A cataract is the gradual clouding of the eye's lens. This clouding can cause loss of vision. Vision can then be restored only with surgery.
- age-related macular degeneration (AMD). AMD is a disease that damages the back part of the eye and can cause a loss of central vision.
- pterygium or pingueculum. These growths on the outer coat of the eye that are common in people who spend a lot of time outdoors in sunny climates.
- skin cancer. The eyelids are a common place for skin cancers.
- sunburn of the cornea (the clear outer layer on the front of the eye). This may also be called snow blindness.
What kinds of sunglasses reduce eye damage from sunlight?
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.
Developed by RelayHealth.
Published by RelayHealth.
Last modified: 2010-12-06
Last reviewed: 2010-10-27
This content is reviewed periodically and is subject to change as new health information becomes
available. The information is intended to inform and educate and is not a replacement for medical
evaluation, advice, diagnosis or treatment by a health care professional.