What are UV rays?

UV, or ultraviolet radiation, is a form of light that we cannot see. It is divided into three types: UVA, UVB, and UVC. The Earth’s atmosphere blocks UVC rays, but UVA and UVB rays reach the surface—and your eyes—where they can cause damage over time.

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How do UV rays affect unprotected eyes?

Prolonged exposure to UV rays can trigger changes inside the eye. For example, the proteins in the eye’s natural lens may become cloudy, forming cataracts. Cataracts interfere with color vision, night vision, and clarity—and while they can be removed surgically, they cannot be reversed.

UV radiation can also damage the retina, irritate the tissues around the eye, and cause photokeratitis—a painful “sunburn” of the cornea. Even though photokeratitis is temporary, it can cause intense discomfort and light sensitivity.

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How can I tell if my sunglasses offer enough protection?

Choose sunglasses labeled as blocking 99% to 100% of UVA and UVB rays. A “UV 400” label indicates full UV protection, as these lenses block wavelengths up to 400 nanometers.

To reduce glare and maintain comfort, look for sunglasses that filter out 75–90% of visible light. This helps prevent squinting and protects your eyes from bright reflections.

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What are polarized lenses?

Polarized lenses contain a special filter that reduces glare coming from flat, reflective surfaces such as water, snow, and roads. They’re especially helpful for outdoor activities like fishing, skiing, golfing, jogging, and driving. Polarized lenses are typically labeled clearly so you can identify them easily.

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Are there other ways to protect my eyes from sunlight?

For extra coverage, especially along the sides and top of your frames, wearing a wide-brimmed hat can help reduce overall exposure. If you wear corrective lenses, consider UV-blocking contact lenses as an additional layer of protection—paired with non-prescription sunglasses, they offer comprehensive defense against harmful rays.