Ultraviolet light (UV) is an invisible portion of the spectrum that is able to penetrate cloud cover and is responsible for tanning and burning the skin. Recent studies have linked lifetime exposure to sunlight with acceleration of the development of cataracts and degeneration of the macula. The depletion of the ozone layer prompts further concern for our eyes because it is this layer of the earth's atmosphere that naturally filters out some UV wavelengths. While the sun is the primary source of UV light, other sources include VDT's (video display terminals) and fluorescent lights.
What can be done to prevent damage to the eye and reduction of visual activity?
A good pair of sunglasses will protect the eye from direct sunlight, as well as light reflected off of water or snow. Avoid buying dimestore sunglasses, insist on those labeled "100% UV protection". Additional benefits of wearing sunglasses are reduced eye strain and less squinting (which causes wrinkles around the eyes!)
Prescription lenses can be treated with a coating that absorbs UV light and prevents it from reaching the eye.
Although impossible to avoid the sunlight, it is wise to limit the time you spend unprotected, in the sun. 80-90% of the UV light radiation occurs between 10 a.m. and 1 p.m. UV light protection during those hours, particularly during the summer months, is advisable.
