The sunlight that reaches the earth has ultraviolet A and
ultraviolet B (UVA and UVB) rays. These ultraviolet rays are the main causes of
damage to the skin from the sun. UVA and UVB rays affect the skin's sensitivity
to sun exposure in different ways.
Can pass through window glass.
not affected by a change in altitude or weather.
Is present all day
and every day of the year.
Penetrates deep into skin
Is 20 times more abundant than UVB rays.
long-term skin damage.
Cannot pass through window
Helps the body make vitamin D.
During the middle of the
In the summer.
At high altitudes and near the
Can cause skin cancer and cataracts.
Use a sunscreen that has a
sun protection factor (SPF) of at least 15 or higher.
Sunscreens that say "broad-spectrum" can protect the skin from ultraviolet A
and B (UVA and UVB) rays. Sunscreens come in lotions, gels, creams, and
Primary Medical Reviewer
William H. Blahd, Jr., MD, FACEP - Emergency Medicine
Specialist Medical Reviewer
H. Michael O'Connor, MD - Emergency Medicine
September 1, 2011
WebMD Medical Reference from Healthwise
September 01, 2011
This information is not intended to replace the advice of a doctor.
Healthwise disclaims any liability for the decisions you make based on this