Sunglasses are undoubtedly the ultimate fashion accessory, but there is a lot more benefit to a good pair of sunglasses than simply making a fashion statement. Below is some helpful information as to why wearing sunglasses is important.
Sunglasses protect your eyes from harmful UV rays which have been associated with the development of cataracts and age-related macular-degeneration, cataracts and cancer of the eye and eye lid. Sunglasses protect your eyes by blocking the sun's harmful UV rays - including UVA, UVB, UVC and blue light.
UV ray exposure causes 90 percent of all skin cancers. UV rays also cause wrinkles and premature aging. Fortunately good sunglasses not only protect the eye itself, but the delicate skin around the eye as well.
All surfaces reflect light. Surfaces like water, snow and automobile windshields can cause extremely bright reflections that are distracting and can interfere with vision. Reflective glare is especially dangerous when driving, riding a motorcycle, biking, skiing or boating. Sunglasses reduce glare for safer, more controlled vision. Polarized sunglasses are particularly effective at reducing glare from surface reflections.
Sunglasses are an effective wind barrier. Wearing sunglasses reduces the rate of evaporation of tears and helps keep your eyes moist and comfortable. Sunglasses also help keep contact lenses from drying out and prevent windblown particles from getting in your eyes and causing a corneal abrasion.
HEADACHE & EYESTRAIN
The pupil controls how much light reaches the light-sensitive retina in the back of the eye. In dim light the pupil increases in size (dilates) to allow more light in. In bright light the pupil constricts to keep too much light from striking the retina. In very bright conditions, the pupil cannot constrict small enough to reduce light to a comfortable level. This causes a person to squint. Muscle fatigue associated with squinting and constant constriction of the pupil can lead to headaches and eyestrain. Sunglasses reduce the amount of light reaching the eyes to a more comfortable level, eliminating the need for squinting and severe pupil constriction. This increases comfort and reduces the risk of headaches and eyestrain.
Our eyes require a certain range of ambient light for good vision. Too much light is as bad as too little. Excessive brightness causes glare, light induced "bleaching" of the retina, and squinting - all of which can temporarily reduce visual acuity. On bright sunny days, sunglasses reduce the amount of light that reaches the retina to more optimal levels for clear, comfortable vision.
Polarized sunglasses have been popular for years with boaters and fishermen who need to reduce reflected glare from the water surrounding them. But now many others who spend time outdoors have discovered the benefits of polarized lenses. Besides boaters, outdoor enthusiast who benefit the most from polarized sunglasses include skiers, bikers, golfers, equestrians, joggers, etc. all who may enjoy a clearer view along with elimination of glare. Polarized sunglasses can also be used for driving and, in fact, can reduce glare from a long flat surface such as the hood of a car or the road's surface itself. Polarized sunglasses can also be worn indoors by light-sensitive people including post-cataract surgery patients and those continually exposed to bright light through windows. Light reflected from surfaces such as a flat road or smooth water generally is horizontally polarized. This means that, instead of light being scattered in all directions in more usual ways, reflected light generally travels in a more horizontally oriented direction. This creates an annoying and sometimes dangerous intensity of light that we experience as glare. Polarized lenses contain a special filter that blocks this type of intense reflected light, thus reducing glare. For most other sports and other activities, polarized sunglasses offer optimal advantage.