UVA and UVB ultraviolet rays are different

• April 24, 2024

Excessive solar exposure without control to the radiation that comes from the sun, results in a severe Y permanent aggression for our skin.

The sun emits electromagnetic radiation with different wavelengths, within these we find the waves that form the portion of the ultraviolet radiation (UV ) and by their frequency they are divided between 290 and 400 nm (nanometers).

When we expose ourselves to the sun our skin changes color, because the radiation stimulates the body to protect itself and this is done by shielding through a mechanism in which more melanin is produced (dark pigment) that filters part of the radiation minimizing The effect; that's why the color of the skin darkens.

Ultraviolet (UV) radiation is divided into two different segments:

1. GRAPE: Totally reaches the earth's surface; tan immediately , but its result is short-lived. They have the ability to penetrate the glass and penetrate to the deepest layers of the dermis , where they generate free radicals that cause cellular alterations and cause the premature aging of the skin (wrinkles, spots and lack of elasticity), in addition to causing cancer.
2. UVB: Penetrate less than GRAPE, But they are more reflective ; 90% is blocked by ozone and oxygen from the atmosphere and as it is more energetic, it is more harmful to the biosphere; It causes a greater effect on the skin since it starts the effect quickly and then it acts slowly which takes a longer time, giving the tanned skin tone. They are indispensable for the synthesis of vitamin D and they are easily filtered with glasses, clothes and sunscreens. A prolonged exposure depresses the immune system and the cornea of ​​the eye absorbs them. The most serious damage is that it burns the tissue and this is similar to that produced by direct heat, that is, reddened areas, peeling, blisters, burning and pain.

The GRAPE combined with UVB they are the first cause of melanoma.

To protect the skin against radiation UV it is covered with creams provided with sunscreens (photoprotector ); These are classified according to their factor number.

The degree of protection against radiation GRAPE is determined by the index PPD (ability to produce lasting pigmentation ):

The degree of protection against radiation UVB known as FPS (sun protection factor ) or also called IPS (sun protection index ); will refer to the ability of the product to filter or block the passage of sunlight. The degree of FPS indicates the number of times that the photoprotector increases the natural defense capacity of the skin compared to erythema (redness)

How to properly use sunscreens (photoresists)?

1. Use sunscreens appropriate to your physical characteristics (phototype), and that contain filters against the rays UVA and UVB.
2. Use enough, covering all the body surface . Do not forget areas like ears or the scalp in the case of young children and baldness .
3. Apply the products always with the Dry Skin . If the skin is wet, the drops work like a magnifying glass and increase the risk of them Burns.
4. Make the first application at least 30 minutes before exposing yourself to the sun.
5. During sun exposure you should reapply sunscreen (photoprotector ) after each prolonged bath (more than 20 minutes ) or every 2 hours. In addition, it is convenient to use water resistant blockers.

Video Medicine: UVA vs UVB Sun Protection Guide #uva #uvb (April 2024).