EyeWitness Fall 2010 - 33

the ABCs of GPs
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this article has been submitted for one continuing education credit unit with the national contact lens examiners (ncle). all technical articles that appear in EyeWitness for c.e. credit can also be found at the clsa University at www.clsa.info. Online, CLsA members can complete these courses for FREE, and nonmembers pay just $18 per course. completed c.e. tests that are faxed or mailed-in to clsa at 441 carlisle Drive, Herndon, Va 20170, fax (703) 437-0727, will carry a $10 processing fee for clsa members, and a $25 fee for nonmembers. cUP 138 level 1

credit card: ❑ american express ❑ Discover ❑ mastercard ❑ Visa card number _________________________________________________________ signature ______________________________________ exp. Date _____________ 1. Good candidates for GP lenses should have: a. corneal and refractive astigmatism that are similar in degree and axis b. Upper lids that are above the superior limbus c. Pupils that are large in dim illumination d. against-the-rule astigmatism 2. Patients who do well with GP lenses are: a. children whose parents are successful GP wearers b. Pilots, police officers and firefighters c. football and soccer players d. Part-time contact lens wearers 3. Corneal edema, overwearing abrasions and changes in corneal topography were often seen with: a. Polymethylmethacrylate lenses b. silicone acrylate lenses c. fluorosilicone acrylate lenses d. Hydroxyethylmethacrylate lenses 4. Plasma treatment of GP lenses: a. makes their surface more hydrophilic b. requires the use of abrasive cleaners c. increases the lens wetting angle d. requires the use of a chemical antioxidant 5. the base curve of a contact lens: a. is the distance from the inner surface of the lens periphery to its imaginary center b. is sometimes referred to as the central anterior curve c. should be made steeper in patients with large corneas d. should be made flatter in patients with small corneas 6. if the optical zone of an GP lens is too large: a. lens movement may be jerky during downward excursions b. Patients may experience flare and starbursts around lights at night c. it may be impossible to establish a fulcrum in the horizontal meridian d. it should be reduced so that its size equals the base curve of the lens in diopters 7. secondary curves are added to an GP lens: a. Because the typical cornea flattens from apex to periphery b. Because the typical corneal steepens from apex to periphery c. to enhance the radius of curvature of the lens d. to create a tear reservoir under the contact lens 8. A Cn bevel is sometimes added to an GP lens to: a. thin out the edge of a high minus lens b. to blend the junction between the base curve and secondary curve c. to reduce impingement on the superior limbus d. to reduce the optical zone of the lens
EyEWitnEss FALL 2010 |

9. A hyperflange can be added to an GP lens to: a. reduce the edge thickness of a high minus lens b. improve the centration of a high plus lens c. add thickness to improve the durability of a lowpowered lens d. thicken the edge of a high plus lens 10. A high plus GP contact lens measured in FVP: a. is placed concave-side-up b. is placed concave-side-down c. will measure more plus power than BVP d. should always be reordered using back vertex power 11. in order to calculate the power of an GP lens correctly: a. the refraction must be in minus cylinder form b. the refraction must be in plus cylinder form c. the plus tear layer must be considered if the lens is fit flatter than “K” d. the minus tear layer must be considered if the lens is fit steeper than “K” 12. Lenses with square or rolled-out edges: a. may position erratically or even be expelled from the eye b. Generally provide good comfort c. Help to maximize good blinking patterns d. may provide a cookie-cutter-like effect with each blink 13. GP lenses that are fit on alignment: a. should move downward with each blink as if they were attached to the underside of the upper lid b. should be fit approximately 0.50 D steeper than “K” in low astigmats c. should fit between the lids and center well d. fit best in patients whose upper lids are above the upper limbus 14. intrapalpebral lenses may be good problem-solvers for patients who: a. Have had problems with lens adherence b. Have with-the-rule corneal astigmatism c. Have large pupils in dim illumination d. are poor blinkers 15. ideal candidates for aspheric lenses: a. should have at least 0.75 D of with-the-rule astigmatism b. are patients who have experienced adherence with spherical lenses c. are patients with oblique or against-the-rule astigmatism d. are patient who have been unable to achieve an alignment, lid attachment fit with other designs
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Please Record Answers Below by filling in appropriate circle

1. A B C D 2. A B C D 3. A B C D 4. A B C D 5. A B C D 6. A B C D 7. A B C D 8. A B C D 9. A B C D 10. A B C D 11. A B C D 12. A B C D 13. A B C D 14. A B C D 15. A B C D 16. A B C D 17. A B C D 18. A B C D
C 19. A B 33 D

c o n ta c t l e n s s o c i e t y o f a m e r i c a

20. A B C D

EyeWitness Fall 2010

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