Eye health resource
Protecting Your Eyes From UV Rays
Protect your eyes from ultraviolet light with sunglasses that block 99–100% of UVA and UVB or are marked UV400. Learn why fit and coverage matter, how hats and reflective environments affect exposure, and why dark or polarized lenses are not the same as UV protection.
Reviewed for accuracy by Justin Bazan, OD on .
The most important feature in sunglasses is verified ultraviolet protection. Look for lenses labeled to block 99–100% of UVA and UVB radiation or marked UV400.
Ultraviolet exposure accumulates over time and is associated with eye and eyelid damage, including cataract and other conditions. Sunglasses reduce exposure; they do not guarantee that a person will never develop an age-related eye disease.
Dark Lenses Are Not Automatically Better UV Protection
Tint darkness controls how much visible light reaches the eyes. UV protection depends on the lens material and UV-blocking treatment, not simply how dark the lens looks.
A very dark lens without adequate UV protection is not a good substitute for a properly labeled UV-blocking lens.
Polarization Reduces Glare, Not UV by Itself
Polarized lenses can reduce reflected glare from roads, water, snow, and other horizontal surfaces. This can improve visual comfort for driving and outdoor activities.
Polarization and UV protection are separate features. A good polarized sunglass should also provide appropriate UVA/UVB protection.
Fit and Coverage Matter
Sunlight can reach the eyes from above, below, and around the sides of a small frame. Sunglasses that fit close to the face or have larger or wraparound coverage can reduce peripheral exposure.
A brimmed hat or cap can add shade and reduce light reaching the eyes from above.
UV Exposure Can Be Significant in Reflective Environments
Water, snow, sand, and other reflective surfaces can increase the amount of ultraviolet light reaching the eyes. Sunglasses are useful even when the temperature is cool and even on days that do not feel intensely sunny.
For skiing, boating, beach activities, and similar environments, good coverage can be especially helpful.
What About Contact Lenses With UV Blocking?
Some contact lenses include UV-blocking properties, but they cover only part of the eye and do not protect the eyelids or surrounding skin. UV-blocking contacts are not a replacement for sunglasses when sun protection is needed.
Do Expensive Sunglasses Protect Better?
Not necessarily. Price can reflect frame construction, lens optics, coatings, design, brand, warranty, or materials, but an expensive logo does not automatically mean stronger UV protection.
Choose sunglasses that clearly state their UV protection. Fit, optical quality, comfort, and durability can then help you decide among suitable options.
Children Need UV Protection Too
Children should also use sunglasses that block 99–100% of UVA and UVB when they spend meaningful time outdoors. Comfortable frames and impact-resistant materials can make sense for active children, and a hat provides additional shade.
Protective Eyewear Is Different From Sunglasses
Sunglasses are designed primarily for light and UV protection. For construction, home repairs, chemicals, yard work, sports, or another activity with impact or splash risk, use safety glasses, goggles, or sports protection designed for the hazard.
Sunglasses at Park Slope Eye
Park Slope Eye offers sunglasses and prescription-sunglass options within our independent optical selection. Depending on your prescription and use, we can also discuss polarization, photochromic lenses, sports eyewear, high-index materials, and other lens options.
If you need an updated prescription before ordering sunglasses or regular eyewear, learn about comprehensive eye exams or book an appointment online.
Originally published . Substantially updated .