Educating Patients About Ultraviolet Radiation

BY STEPHEN COHEN, OD

1. Fresh snow reflects as much as what percent of UV-B?
a. 40
b. 55
c. 70
d. 85

2. Every 1 percent decrease in the atmospheric ozone layer results in about what percent of UV-B exposure?
a. 8
b. 6
c. 4
d. 2

3. The extreme high point on the UV index is:
a. 11 or more
b. 9
c. 7
d. 5 or less

4. About what percent of patients believe that all contact lenses provide UV protection?
a. 10
b. 20
c. 30
d. 40

5. Which of the following is a Class 1 contact lens that blocks more than 90 percent UV-A and 99 percent UV-B?
a. Acuvue Oasys
b. Biomedics
c. Precision UV
d. Maxsight

6. Which route for sunlight reaching the eye for ultraviolet radiation is more important?
a. Direct
b. Scattered
c. Reflected
d. Refracted

7. For every 1,000 feet in elevation, UV-B exposure increases about what percent?
a. 10
b. 20
c. 30
d. 40

8. Grass and soil reflect about what percent of ultraviolet radiation?
a. 10
b. 20
c. 30
d. 40

9. Minas Coroneo in describing the peripheral light focusing effect (PLF) concluded that light is how many times stronger on the nasal limbus?
a. 42
b. 32
c. 22
d. 12

10. A soft contact lens that blocks out greater than 70 percent UV-A and 95 percent UV-B is Class:
a. 1
b. 2
c. 3
d. 4

11. The wavelengths of visible light range from about how many nanometers?
a. 200 to 290
b. 290 to 380
c. 380 to 780
d. more than 780

12. Ozone loss per decade appears to be about what percent?
a. 0 to 2
b. 3 to 6
c. 7 to 10
d. 11 to 14

13. According to the World Health Organization (WHO), 80 percent of lifetime ultraviolet radiation exposure occurs by what age?
a. 30
b. 24
c. 18
d. 12

14. According to Minas Coroneo, about what percent of children had signs of eye damage from ultraviolet radiation by age 15?
a. 80
b. 60
c. 40
d. 20

15. According to a National Eye Institute survey, more than 70 percent of respondents rated loss of vision on a 10-point scale as:
a. 10
b. 9
c. 8
d. 7

16. About what percent of consumers know that ultraviolet radiation may damage their eyes?
a. 10
b. 20
c. 30
d. 40

17. UV-B comprises about what percent of the total incident sunlight outside the atmosphere?
a. 2
b. 4
c. 6
d. 8

18. Every 1 percent decrease in the atmosphere ozone layer results in about what percent increase in carcinoma?
a. 1 to 3
b. 4 to 6
c. 7 to 9
d. 10 to 13

19. The WHO estimates that about what percent of all blinding cataracts are due to sun exposure?
a. 5
b. 10
c. 15
d. 20

20. It is estimated that about what percent of ultraviolet radiation is transmitted by the crystalline lenses of children younger than 10?
a. 100
b. 75
c. 50
d. 25


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