Skin Care

Wednesday, November 29, 2006

Why UVB and UVA Affect the Skin by Lim Zheng Yang

Do you know that if you wear sunscreen, it is perhaps the most important skin-care solution available to prevent wrinkles?
But most people do not use it correctly though, thereby exposing themselves to ultraviolet light, UVA or UVB, from sunlight, which accounts for 90% of the symptoms of premature skin aging including wrinkles.
Important factors to consider when you wear sunscreen are the spectrum of UV radiation absorbed, the amount to be applied, and the frequency of application.
UV Radiation
The sun gives off ultraviolet (UV) radiation that we divide into categories based on the wavelength.
UVC radiation is absorbed by the atmosphere and does not cause skin damage.
UVB radiation affects the outer layer of skin, the epidermis, and is the primary agent responsible for sunburns.
UVB does not penetrate glass, and the intensity of UVB radiation depends on the time of day and the season.
UVA radiation penetrates deeper into the skin and works more efficiently.
The intensity of UVA radiation is more constant than UVB without the variations during the day and throughout the year. UVA is also not filtered by glass.
UV Radiation and Wrinkles
Both UVA and UVB radiation cause wrinkles by breaking down collagen, creating free radicals, and inhibiting the natural repair mechanisms of the skin.
A popular classification system of sun-sensitivity is the Skin Phototype (SPT) classification.
People with skin types I and II are at the highest risk for photoaging effects including wrinkles and skin cancer.
Knowing how to wear sunscreen properly to block both UVA and UVB radiation is an important weapon in battle against wrinkles.

About the Author
Lim Zheng Yang used to suffer from acne and has spent countless hours researching on this skin condition and the best ways to treat it. His main site about self esteem, his blog for about self-esteem issues


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