ULTRA VIOLET PROTECTION
The UV rays in sunlight can be harmful to the eyes. Lenses that block 100% UVA and UVB help to ward off the damaging effects of UV radiation. Transition, high index and many other lens options offer 100% UV protection.
Anyone who spends time outdoors is at risk for eye problems from UV radiation. Risks of eye damage from UV and HEV exposure change from day to day and depend on a number of factors, including:
Geographic location. UV levels are greater in tropical areas near the earth's equator. The farther you are from the equator, the smaller your risk.
Altitude. UV levels are greater at higher altitudes
Time of day. UV and HEV levels are greater when the sun is high in the sky, typically from 10 a.m. to 2 p.m.
Setting. UV and HEV levels are greater in wide open spaces, especially when highly reflective surfaces are present, like snow and sand.
Medications. Certain medications, such as tetracycline, sulfa drugs, birth control pills, diuretics and tranquilizers, can increase your body's sensitivity to UV and HEV radiation.
Surprisingly, cloud cover doesn't affect UV levels significantly. Your risk of UV exposure can be quite high even on hazy or overcast days. This is because UV is invisible radiation, not visible light, and can penetrate clouds.