Test Your Sunscreen Knowledge Part II

...continued...



Originally published in SkinNews, Volume XVI, Issue 2, Fall 2009 by Richard G. Asarch, M.D.


6. Sunscreen ingredients fall into two categories: chemical and physical. Chemical blockers absorb the ultraviolet rays and prevent cell damage while physical blockers reflect the sun's rays away from the skin. The two physical blockers are:
a. Titanium oxide and octinoxate
b. Octinoxate and zinc oxide
c. Titanium oxide and zinc oxide


7. SPF only refers to UVB ray protection, but ultraviolet A ray (UVA) exposure is also damaging to your skin. In order to protect against UVA rays, the following ingredients should be in your sunscreen:
a. Octinoxate, PABA, homosalate
b. Avobenzone, titanium dioxide, zinc oxide, ecamsule (Mexoryl)
c. Padimate O, homosalate, octyl methoxycinnamate

8. If you have brown spots or pigment discoloration problems in sun-exposed areas, it is essential for you to choose a sunscreen that has a high SPF plus:
a. Protects against UVB
b. Protects against UVA and UVB
c. Protects against UVA

9. Using a water-resistent sunscreen while in the water or while performing an activity that makes you sweat profusely, requires that you:
a. Reapply every 90-120 minutes
b. Not necessary to reapply
c. Reapply immediately after swimming, towel drying or heavy sweating

10. Shad and protective clothing is advocated for protection of babies. Use of sunscreen on babies should not be used on babies:
a. Under 3 months of age
b. Under 6 months of age
c. Under 1 year of age

Answers:
6) c, 7) b, 8) b, 9) c, 10) b

Test Your Sunscreen Knowledge - Part 1

Originally published in SkinNews, Volume XVI, Issue 2, Fall 2009 by Richard G. Asarch, M.D.

1. The SPF notation on sunscreens measures the protection against the sun's ultraviolet B (UVB) radiation. SPF tells you:

a. How long it will take your skin to sunburn with sun exposure when using the sunscreen vs. how long it will take your skin to sunburn without sunscreen

b. The percentage of active ingredients in sunscreen

c. The number of hours you can stay safely in the sun

2. A sunscreen with an SPF of 15 protects against approximately 93% of the sun's UVB rays while a sunscreen with an SPF of 30 protects against:

a. 97% of the sun's UVB rays

b. 93% of the sun's UVB and UVA rays

c. 95% of the sun's UVB rays

3. A sunscreen with an SPF of 100 will protect against:

a: 100% of the sun's UVB rays

b. 99% of the sun's UVB rays

c. 97% of the sun's UVB rays

4. The FDA test for determining a sunscreen's SPF protection is based on a generous application of at least 2 ounces at a time. Realistically, most people do not apply that amount. At one-half of the recommended application amount, a sunscreen with an SPF of 30 would yield an SPF of:

a. 30

b. 15

c. 7-8

5. If you first apply a sunscreen with an SPF of 20 and then one with an SPF of 30, the effective SPF you have achieved is:

a. 25

b. 30

c. 50

Answers to questions 1-5:

1) a, 2) a, 3) b, 4) c, 5) b

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