Tips: Blocking the Sun

Ultraviolet rays in sun light can cause serious and often irreversible harm to the body. This can range from eye damage to the more extreme, skin cancer.


Sun Protectiom Factor (SPF)

The sun protection factor (SPF) determines what percentage of the ultraviolet rays get through to the skin. A SPF of 15 allows only 1/15 (7%) of the sun’s rays to get through and extends safe sun exposure from 20 minutes to 5 hours without the skin burning. A SPF higher than 15 protects against sunburn for more than 5 hours.


  • When going to the beach use a sun block with a SPF 25 or higher.
  • For everyday use, apply sunscreen with SPF 15 or higher.



Sunscreens will wash away with sweat and water, especially after swimming. “Water resistant” sunscreen can maintain their SPF after 40 minutes of water immersion, and the “waterproof” after 80 minutes. Saltwater reduces the SPF faster than freshwater.


Apply the sunscreen at least twice more frequently than recommended (about every 2 hours) for water activities, especially for sea water activities.

  • Re-apply immediately after swimming or profuse sweating.


More Tips:

  • Use the type of sunscreen of your preference. Make sure you read the recommendation when to reapply the sunscreen (usually every 3 or 4 hours).
  • Apply sunscreen 30 minutes before exposure to the sun to give it time to penetrate the skin.
  • Give special attention to the area’s most likely to become sunburned, such as your nose, ears, cheeks and shoulders.
  • Use a sunscreen every day even when it’s a cloudy day.
  • Wear UV close-fitting protecting sunglasses to protect against eye damage.
  • Wear sun protective clothing. Dark, tightly woven clothes are best.
  • Use shade and limit your exposure to the sun, especially between 10 am and 4 pm, when radiation is at its strongest.
  • Don’t forget to keep hydrated, drink a lot of water.

Wear a hat that protects your face, neck and ears.

by: BIMC Hospital




More On