UVA and UVB rays are the primary source of concern for the skin, so let’s examine them in greater detail.
Ultraviolet A (UVA) rays
- UVA rays account for 95% of all radiation reaching the earth.
- They have longer wavelengths and lower energy levels than other forms of ultraviolet radiation. However, because they are more penetrating than UVB rays, they can affect deeper layers of the skin and cause indirect DNA damage.
- They cause the skin to age more rapidly or prematurely, which manifests as wrinkles. These are also linked to certain types of skin cancer.
- They are not absorbed by the ozone layer, unlike UVB rays, and thus approximately 95% of this radiation reaches the earth. This results in immediate tanning and, if left out too long, sunburns.
Ultraviolet B rays
- UVB rays account for only 5% of radiation due to their filtering by the ozone layer.
- Because they have shorter wavelengths and a higher energy level, they cause damage to the skin’s outermost layers and can directly damage DNA.
- UVB rays are responsible for the majority of skin cancers, but they can also cause wrinkles.
About the Author:
Germie Alderite is a Registered Medical Technologist in the Philippines. She is currently studying Doctor of Medicine in the said country. Germie worked in an Adventist Wellness Center for a year before entering Medical School. She believes that many transgress the laws of health through ignorance, thus, people need instruction. They need to be impressed with the importance of making their knowledge a guide of life. Physician has many opportunities both of imparting a knowledge of health principles and of showing the importance of putting them into practice.
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