Contact Lens Materials Update 2008

BY GREGORY J. NIXON, OD, FAAO

1. A main water-absorbing chemical monomer of many soft contact lenses is:
a. Silicone
b. Fluorine
c. Hydroxyethyl-methacrylate
d. Methylmethacrylate

2. The long-held minimum Dk value for limited overnight corneal swelling is:
a. 117
b. 107
c. 97
d. 87

3. Failure to create a smooth water-loving surface on a silicone hydrogel lens does not lead to:
a. Hypoxia
b. Lens dehydration
c. Poor lens wettability
d. Increase lens friction

4. Hydraclear used in Vistakon’s Acuvue Advance and Acuvue Oasys is a wetting agent with:
a. PVP
b. MMA
c. HEMA
d. MA

5. The Dk of Menicon Z lenses is about:
a. 163
b. 85
c. 151
d. 100

6. A low-water, nonionic soft lens material is in which FDA category?
a. Group 1
b. Group 2
c. Group 3
d. Group 4

7. The CIBA Vision lower-modulus silicone hydrogel is:
a. PureVision
b. Night & Day
c. O2Optix
d. Avaira

8. Which contact angle indicates poorer adhesion between the precorneal film and a contact lens material?
a. 50 degrees
b. 60 degrees
c. 70 degrees
d. 80 degrees

9. Which company uses Aquaform technology on some of its silicone hydrogel lenses?
a. Bausch & Lomb
b. CooperVision
c. CIBA Vision
d. Vistakon

10. Which is not a fluorosilicone acrylate (FSA) material?
a. Equalens
b. Fluorocon
c. Paragon HDS
d. Paraperm EW

11. Most Dk/t values are referenced in relation to what power?
a. –2.00D
b. –3.00D
c. –4.00D
d. –5.00D

12. CooperVision’s Biofinity silicone hydrogel lens has a Dk of about:
a. 98
b. 108
c. 118
d. 128

13. CIBA Vision’s Night & Day lens is in which FDA group?
a. 1
b. 2
c. 3
d. 4

14. Vistakon’s Acuvue Advance for Astigmatism silicone hydrogel lens has a Dk of about
a. 60
b. 70
c. 80
d. 90

15. Biofinity has a modulus of about:
a. 1.4
b. 1.2
c. 0.8
d. 0.4

16. Because the highest practical water content for any traditional hydrogel contact lens material is about 80 percent, maximum Dk is about:
a. 60
b. 50
c. 40
d. 30

17. CIBA Vision’s Air Optix Aqua has a water content of about:
a. 43 percent
b. 33 percent
c. 23 percent
d. 13 percent

18. Bausch & Lomb’s PureVision lens is in which FDA group?
a. 1
b. 2
c. 3
d. 4

19. CIBA Vision’s Focus Dailies with AquaRelease uses what as an internal wetting agent?
a. PVP
b. PVA
c. HEMA
d. MA

20. Night & Day has a water content of about:
a. 24
b. 33
c. 38
d. 46


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