Author: Dr Val Phua
Estimated reading time: 8–10 minutes
Your Eyes Need Protection from the Sun Too
Most people understand the importance of protecting their skin from the sun, but many overlook the effects of ultraviolet (UV) radiation on their eyes.
Just like your skin, your eyes are exposed to UV radiation every day. Over many years, cumulative UV exposure can increase the risk of several eye conditions, including cataracts, pterygium, photokeratitis and age-related macular degeneration.
The good news is that protecting your eyes is simple. Wearing appropriately designed sunglasses and adopting sensible sun protection habits can significantly reduce lifelong UV exposure.
What Is UV Radiation?
Sunlight contains different types of ultraviolet radiation.
UVA
UVA rays make up approximately 95% of the UV radiation reaching the Earth’s surface.
They penetrate deeper into tissues and contribute to long-term ageing and cumulative eye damage.
UVB
UVB rays carry more energy than UVA and are responsible for sunburn.
They also increase the risk of acute eye injuries such as photokeratitis and contribute to cataract formation.
UVC
Fortunately, UVC radiation is absorbed by the Earth’s atmosphere and does not normally reach ground level.
How Does UV Light Affect the Eyes?
Ultraviolet radiation can damage several different parts of the eye.
Cornea
Excessive UV exposure can cause photokeratitis, a painful condition similar to sunburn of the cornea.
Common symptoms include:
- Severe eye pain
- Tearing
- Redness
- Light sensitivity
- Blurred vision
- A gritty sensation
Fortunately, photokeratitis usually heals within 24 to 48 hours with appropriate treatment.
Conjunctiva
Chronic UV exposure increases the risk of pterygium, a wing-shaped growth of tissue extending onto the cornea.
Pterygia are more common in people who spend significant time outdoors, particularly in sunny climates.
Lens
The natural lens absorbs much of the UV radiation entering the eye.
Over many years, cumulative UV damage contributes to the development of cataracts.
Retina
Although the lens blocks most UV light, prolonged exposure to high-energy visible light and cumulative oxidative stress may contribute to retinal ageing.
While the relationship between UV exposure and age-related macular degeneration is less clear than for cataracts, reducing unnecessary UV exposure remains advisable.
Who Is Most at Risk?
Anyone can develop UV-related eye disease, but the risk is higher in people who:
- Work outdoors
- Participate in outdoor sports
- Spend long hours driving
- Live in sunny climates
- Frequently visit beaches or ski resorts
- Have had cataract surgery without UV-blocking lenses (rare with modern intraocular lenses)
- Take medications that increase light sensitivity
Children are also particularly vulnerable because their natural lenses allow more UV radiation to reach the retina than those of adults.
Do Clouds Block UV Rays?
Not always.
Up to 80% of UV radiation may still penetrate cloud cover.
This means your eyes remain exposed even on overcast days.
Are Cheap Sunglasses Safe?
The most important feature of sunglasses is UV protection, not the price.
Choose sunglasses that provide:
- 100% UVA protection
- 100% UVB protection
- UV400 certification
Dark lenses without UV protection can actually be harmful because they cause the pupils to dilate, allowing more UV radiation to enter the eye.
Are Polarised Sunglasses Better?
Polarised lenses reduce glare reflected from surfaces such as water, roads and snow.
They improve comfort and visual clarity but do not automatically provide better UV protection.
Ideally, sunglasses should be both:
- UV400 certified
- Polarised (when appropriate)
Do Contact Lenses Protect Against UV?
Some contact lenses incorporate UV-blocking materials.
However, they do not cover the entire eye or surrounding tissues.
Even if you wear UV-blocking contact lenses, sunglasses remain recommended.
How Can I Protect My Eyes from UV Damage?
Simple habits can significantly reduce lifetime UV exposure:
- Wear sunglasses with UV400 protection.
- Choose wraparound frames for greater coverage.
- Wear a wide-brimmed hat outdoors.
- Avoid looking directly at the sun.
- Wear sunglasses even on cloudy days.
- Protect children with hats and sunglasses.
- Use appropriate eye protection during snow sports and water activities.
Frequently Asked Questions
Are expensive sunglasses better?
Not necessarily. The most important feature is certified UV400 protection rather than brand or cost.
Can children wear sunglasses?
Yes. Children’s eyes are particularly susceptible to UV damage, making appropriate sun protection especially important.
Do I need sunglasses in Singapore?
Yes. Singapore’s tropical climate results in significant year-round UV exposure, making sunglasses with UV protection advisable whenever spending prolonged periods outdoors.
Can UV damage be reversed?
Most chronic UV-related eye damage cannot be reversed. Prevention remains the best strategy.
The Bottom Line
Ultraviolet radiation can gradually damage the eyes throughout life, increasing the risk of cataracts, pterygium and other eye conditions.
Fortunately, protecting your vision is straightforward. Wearing UV400-certified sunglasses, using a wide-brimmed hat and limiting excessive sun exposure can substantially reduce cumulative UV damage.
Combined with regular comprehensive eye examinations, these simple measures help preserve healthy vision for years to come.
References
- American Academy of Ophthalmology. Protecting Your Eyes from UV Light.
- World Health Organization. Ultraviolet Radiation and Eye Health.
- National Eye Institute. Sun Safety and Eye Protection.
- International Commission on Non-Ionizing Radiation Protection. Guidelines on UV Exposure.
- American Optometric Association. Ultraviolet Radiation and Ocular Health.
