Know More About Ultraviolet Protection And Buying Sunglasses Direct Online

Article Written By: Kathryn Dawson

All of us know that ultraviolet light can be damaging. UV light is a form of electromagnetic radiation. The human eye can see radiation with wavelengths between 400 to 700 nanometres and this is referred to as visible light. On the other hand, ultraviolet light has a shorter wavelength than visible light and cannot be seen by the human eye. The term ultraviolet light was coined from the spectrum of waves with frequencies higher than those that humans identify as the colour violet.

Sunlight contains both visible light and the shorter invisible UV light. There are three types of ultraviolet light and these are UVA, UVB, and UVC.

UVA is long wave light that can pass easily through the ozone layer of the earth. This light penetrates deep into the skin and can cause premature skin ageing and skin cancer. Of the ultraviolet radiation that reaches the earth, almost 99 percent is UVA. But this is not only found in the rays of the sun but also in tanning beds. In fact, tanning beds can give off two to five times more UVA radiation than the sun.

UVB radiation is a small but dangerous part of sunlight. Most of the UVB from the sun is absorbed by the ozone layer. However, prolonged exposure causes sun burn and eye damage. This type of radiation is stronger than UVA radiation, causing burning, premature skin ageing, skin cancer, and serious eye problems. UVB rays are very dangerous, making sunscreens and sunglasses a must for anyone who wishes to stay outdoors.

UVC radiation is the strongest and most dangerous form of UV light. The good news is that these do not reach the atmosphere and to not reach the surface of the earth.

Most people believe that there is no need for sun protection when the sky is overcast. But the truth is that even on a cloudy day, UV light can go right through clouds, especially between ten in the morning to three in the afternoon.

High levels of UVB light are dangerous to the eyes and may cause corneal and retinal damage and also lead to the development of cataracts and pterygium which is a thin tissue that grows over the white part of the eye.

Ordinary sunglasses can give some protection. Usually, plastic lenses provide more protection than glass lenses since UVA light can pass through glass. Plastic lens materials such as polycarbonate block most of the ultraviolet rays. There are also sunglasses with protective treatments to better shield against the sun.

Having sunglasses ready will ensure immediate protection from sunlight. Few people know that even glare and reflections can be dangerous to the eyes too. Driving can cause significant exposure since windshields are a big glare source. Even reflection from the snow, water, or sand can increase the risk for eye damage.

Look for sunglasses that offer from 99 to 100 percent protection from both UVA and UVB light. There are also wraparound sunglasses that prevent harmful ultraviolet rays from entering around the frame, providing protection all around the eyes. There are several basic sunglasses and designer sunglasses to choose from.

A knowledgeable and trustworthy online optician can help choose tints and frames that are best suited to individual needs. Most of designer brands are available at discounted prices over the Internet.

About the Author

Kathryn Dawson - Valley Optics, a store providing sunglasses direct from well known brands like ted baker sunglasses.

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This Article Has Been Published on Fri, 27 May 2011 and Read 191 Times

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