What is UV Radiation?

Light travels through space in the form of waves at different wavelengths. UV waves have a great amount of radiant energy and are not part of the visible light spectrum. UV radiation is part of the electromagnetic spectrum found between X-Rays and visible light. Some insects can see UV light, but UV wavelengths are too short for the human eye to detect.

UV-A has the lowest energy level, but is still a concern to eye care professionals. Most professional tanning salons use UV-A lamps on their customers.

UV-B is recognized as a harmful, destructive form of UV light because it causes skin cancer as well as sunburn.

UV Radiation can reach the eye directly or indirectly. Sunlight reflected off the surface of water, sand, snow or other bright objects reflects UV radiation to the eyes.
Cloudy days are not safe times from UV because the amount of UV transmitted is still significant when the sky is overcast; up to about 80% of its normal intensity.
Many people do not think to wear UV protective lenses on these days even when they are outdoors for long periods of time. This is when damage can occur.
Sunglasses are one of our best lines of defense against damaging radiation from sunlight. Well-designed, well-fitted sunglasses are a must for anyone going outdoors during daylight hours.
Eye care specialists deal with the general misconception that sunglasses have been and remain a fashion accessory first and a preventative measure second.
Wrap-around style sunglasses are not just fashion. They prevent much more harmful light from reaching the eye and its surrounding adnexa than more conventional sunglasses do. When working properly, and fitted well, the glasses block 75% to 90% visible light.
Quality sunglasses will be free of distortions and imperfections, which can cause fatigue and eye strain.

From Carol Dykas 20/20 Magazine