UV Rays: Your Eyes and Protection
You probably understand the link between ultraviolet (UV) radiation and skin cancer. But many are far less aware of the connection between UV radiation and eye damage.
What is UV light?
The sun’s primary danger to us comes in the form of UV light or radiation. UV radiation is a component of solar radiation. Artificial sources like welding machines, tanning beds, and lasers can also give off UV radiation. There are three types of UV radiation. UV-C is absorbed by the ozone layer and does not present any threat. UV-A and UV-B radiation can have adverse long- and short-term effects on the eyes and vision. Have you had cataract surgery in one or both eyes? If your eyes are exposed to excessive amounts of UV radiation over a short period of time, you are likely to experience an effect called photokeratitis. Like a “sunburn of the eye”, photokeratitis may be painful and include symptoms such as red eyes, a foreign body sensation or gritty feeling in the eyes, extreme sensitivity to light and excessive tearing. Fortunately, this is usually temporary and rarely causes permanent damage to the eyes. Long-term exposure to UV radiation, however, can be more serious. Scientific studies and research have shown that exposure to small amounts of UV radiation over a period of many years increases the chance of developing a cataract and may cause damage to the retina, a nerve-rich lining of the eye that is used for seeing. Additionally, chronic exposure to shorter wavelength visible light (i.e. blue and violet light) may also be harmful to the retina. The longer the eyes are exposed to solar radiation, the greater the risk of developing later in life such conditions as cataracts or macular degeneration. Since it is not clear how much exposure to solar radiation will cause damage, the AOA recommends wearing quality sunglasses that offer UV protection and wearing a hat or cap with a wide brim whenever you spend time outdoors. Also, certain contact lenses can provide additional UV protection.
UV Radiation Checklist
If you can answer “yes” to one or more of the following questions, you could be at higher risk for harm to the eyes from UV radiation:
- Do you spend a great deal of time outdoors?
- Do you spend time skiing, mountain climbing or at the beach?
- Do you use a sunlamp or tanning parlor?
- Do you live in the mountains or the United States Sunbelt?
- Are you a welder, medical technologist or do you work in the graphic arts or in the manufacture of electronic circuit boards?
- Do you take prescription or over-the-counter drugs that can increase your sensitivity to UV radiation (check with your ophthalmologist, optometrist, pharmacist, or physician)?
To provide adequate protection for your eyes, sunglasses should:
- block out 99 to 100 percent of both UV-A and UV-B radiation;
- screen out 75 to 90 percent of visible light;
- be perfectly matched in color and free of distortion and imperfection; and
- have lenses that are gray for proper color recognition.
The lenses in sunglasses should be made from polycarbonate or Trivex® material if you participate in potentially eye-hazardous work or sports. These lenses provide the most impact resistance. If you spend a lot of time outdoors in bright sunlight, wrap around frames can provide additional protection from the harmful solar radiation. Don’t forget protection for children and teenagers. They typically spend more time in the sun than adults. Be sure to see your eye doctor every two years for a comprehensive eye examination. It is a good way to monitor your eye health, maintain good vision and keep track of your solar radiation protection needs as well as new advances in eye protection.
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