Most people know UV radiation causes sunburn, but far fewer realize it’s doing the same damage to their eyes every time they step outside without protection. July is UV Safety Month, and here in Houston, where summer sun is intense and outdoor time is plentiful, protecting your eyes from UV radiation isn’t just a summer concern. It’s a year-round necessity. Here’s what UV radiation actually does to your eyes, and exactly how to protect them.
Fast Facts: UV Radiation and Your Eyes
- UV radiation is a major risk factor for developing cataracts — the most common cause of blindness globally
- Your eyes can get sunburned — a condition called photokeratitis — just like your skin
- UVB rays are more damaging to the eyes than UVA rays and are most intense between 10am and 4pm
- UV damage is cumulative and irreversible — it builds up over a lifetime
- Clouds don’t block UV radiation — up to 80% of UV rays pass through overcast skies
- Water, sand, and snow reflect and amplify UV radiation significantly
- Children’s eyes are more vulnerable to UV damage than adults’ — their lenses are less effective at filtering UV light
- Sunglasses labeled “UV 400” or “100% UV protection” block both UVA and UVB rays effectively
How UV Radiation Affects Your Eyes
There are three types of UV radiation: UVA, UVB, and UVC. UVC rays are absorbed by the earth’s atmosphere and never reach the surface. UVA and UVB are the ones that matter for your eye health.
UVA rays penetrate deeper into the eye and are associated with damage to the macula — the central portion of the retina responsible for sharp, detailed vision. Long-term UVA exposure contributes to the development of macular degeneration, one of the leading causes of vision loss in adults over 60.
UVB rays are more energetic and primarily affect the front of the eye — the cornea and lens. They are the main cause of photokeratitis (eye sunburn), cataracts, and pterygium (a fleshy tissue growth on the surface of the eye).
UV-related Eye Conditions You Should Know
Cataracts — UV radiation, particularly UVB, accelerates the clouding of the eye’s natural lens. The World Health Organization estimates that up to 20% of cataracts worldwide are caused by UV exposure. While cataracts are treatable with surgery, prevention through UV protection is far preferable. Learn about cataract surgery at Berkeley Eye Center →
Macular degeneration (AMD) — Cumulative UV and high-energy visible light exposure contributes to AMD, a progressive condition affecting central vision. Once vision is lost to AMD, it cannot be restored. Learn more about AMD and eye health →
Photokeratitis — This is essentially a sunburn on the surface of your cornea. It causes eye pain, redness, tearing, sensitivity to light, and in severe cases, temporary vision loss. It develops rapidly; even a few hours of unprotected exposure on bright water or snow can cause it.
Pterygium — A growth of tissue that spreads across the white of the eye and, if left untreated, can grow over the cornea and affect vision. Extremely common in Houston and other sunny, high-UV environments. Surgery can remove it, but UV protection can prevent it.
Skin cancer around the eyes — The thin skin of the eyelids and around the eyes is one of the most common sites for skin cancers including basal cell carcinoma. UV protection for the eyes also protects this vulnerable skin.
What To Look For in Sunglasses — the Buyer’s Guide
Not all sunglasses protect your eyes equally. Here’s what actually matters:
UV protection rating — the only specification that counts Look for lenses labeled “UV400“ or “100% UV protection” or “blocks UVA and UVB.” This is the single most important feature. A lens rated UV400 blocks all light rays with wavelengths up to 400 nanometers — covering the entire UVA and UVB spectrum. Price has no relationship to UV protection — an inexpensive pair with UV400 rating protects your eyes just as well as an expensive one. What expensive sunglasses provide is durability, optical clarity, polarization, and style.
Polarized lenses Polarization reduces glare — the horizontal reflected light that bounces off water, roads, and car hoods. Polarized lenses don’t block more UV radiation than non-polarized lenses with the same UV rating, but they significantly improve visual comfort and reduce eye strain outdoors. They are especially valuable for driving, fishing, and watersports.
Lens color Lens color affects how you perceive contrast and color, but it does NOT indicate UV protection level. A clear lens with UV400 coating protects as well as a dark gray lens. However, certain tints help in specific situations — amber and brown lenses enhance contrast in low-light conditions; gray lenses reduce brightness without distorting color.
Coverage and wrap Wraparound-style frames offer protection from UV entering from the sides — standard flat frames allow UV from the periphery to reach the eye. For extended outdoor use in Texas, wraparound frames or large-frame styles offer better overall coverage.
Prescription sunglasses If you wear glasses, prescription sunglasses are the best option for consistent UV protection. Relying on clip-ons or wearing contacts with non-prescription sunglasses is less reliable. Berkeley Eye Center’s optical shops carry a full range of prescription sunglasses across all our locations. Browse our sunglasses collection →
Who Needs Sunglasses — and When
Children — Kids’ eyes transmit significantly more UV radiation to the retina than adults’ eyes because their lenses are clearer and less able to filter UV. Children who spend time outdoors without UV protection are accumulating damage that won’t become apparent for decades. If your child will wear them, sunglasses from an early age are worthwhile. Stick to UV400 rated lenses — wrap styles work well for active kids.
Contact lens wearers — Most contact lenses do NOT provide UV protection. Even lenses marketed as UV-blocking don’t cover the full surface of the eye, leaving the conjunctiva (the white of the eye) exposed. Sunglasses are necessary regardless of what type of contacts you wear.
Post-LASIK, post-cataract, and post-refractive surgery patients — UV protection is especially important after any refractive procedure. Your surgeon will provide specific guidance, but wearing quality UV-blocking sunglasses consistently is a standard recommendation for all post-operative patients.
Everyone, year-round — UV radiation is present year-round in Houston, not just in summer. UV index can be high on overcast days, in winter, and at higher altitudes. Make sunglasses a daily habit, not just a beach accessory.
Additional Tips for UV Eye Protection
- Wear a brimmed hat alongside sunglasses — a wide brim can reduce UV reaching the eyes by up to 50%
- Avoid peak UV hours — UV radiation is most intense between 10am and 4pm
- Be extra careful near water, sand, and concrete — all three reflect and amplify UV
- Don’t be fooled by clouds — up to 80% of UV rays penetrate cloud cover
- Get a comprehensive eye exam — UV damage is often invisible until it’s significant. Your Berkeley Eye Center doctor can detect early signs of UV-related conditions like cataracts and macular degeneration and recommend the most appropriate protective measures for your eyes specifically
Frequently Asked Questions About UV Eye Protection
Shop for sunglasses at Berkeley Eye Center
Protecting your vision for a lifetime starts with the right eyewear. Berkeley Eye Center’s optical shops carry a curated selection of prescription and non-prescription sunglasses — including polarized lenses, designer frames, and performance-oriented styles for active Houstonians.
Our licensed opticians can help you find lenses with the right UV protection, polarization, and tint for your lifestyle — whether you’re on the water, on the road, or just navigating a Houston summer.