Being out in the light can leave you in the dark - UV radiation and youThe sun emits different types of electromagnetic radiation, most of which are visible (HEV) light, UV rays, and infrared rays. While UV rays make up only a very small portion of the sun's rays, they are the main cause of the sun's damaging effects on the eyes. UV rays are an overload of energy, which travel through an empty space, creating an imbalance in the chemical structure of the body's molecules, causing cell damage and deformities. © Darren Baker - Fotolia.com Eye problems As UV rays travel with sunlight, the rays can pierce through the thin layer of skin on the eyelids when the eyes are closed or partially closed, making it possible for the rays to reach the eye. The transparent lens and cornea help to protect the eyes by filtering the UV rays, but if direct light continuously reaches the eyes over long periods, this can lead to serious eye problems including:
Are polarised lenses your best weapon against harmful radiation? According to Andre Horn, assistant MD at Mellins i-Style, tinted sunglasses may help to darken glare from the sun. Sharp light however can still obscure your vision and the lenses do not necessarily protect the eyes from harmful radiation. "The best solution for protecting your eyes against damaging rays are polarised lenses that can block 100% UV radiation and absorb other detrimental light." Polarisation occurs when sunlight 'ripples' into various directions and hits a surface to cause a flux of light that reflects into one direction. When reflected from surfaces such as water, sea sand, the windshields of oncoming cars or wet pavements and roads, the polarised light can cause a blinding effect once it reaches your eyes. Polarised lenses eliminate much of these types of glare to improve contrast, make colours more brilliant and ensure outstanding vision, even under extreme light conditions. "These lenses also protect you from eye fatigue because your eyes no longer have to adjust to constantly changing light conditions." To protect your eyes from the sun's harmful rays when outdoors, make sure that you are equipped with good quality polarised sunglasses that can block 100% UV rays and absorb most HEV rays. It is also a good idea to keep your sunglasses on in the shade, as although these cooler areas may reduce the effect of the damaging rays, it does not provide complete protection. For more information, go to www.mellins.co.za. |