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Basic Principles of Contact Lens Fitting Association of astigmatism
Association of Technical Personnel in Ophthalmology (ATPO) COVE Quiz This quiz is worth 1.5 JCAHPO Group A continuing education credits. To obtain the video, call the American Academy of Ophthalmology (AAO) at (415) 561-8540 or visit www.aao.org. BASIC PRINCIPLES OF CONTACT LENS FITTING M. Freeman, MD, P. Rakow, COMT, and R. Campbell, MD 1. The MOST important initial indication for contact lens wearing success is: a. spherical refractive error b. motivation to wear the lenses c. good precorneal tear film d. average corneal curvatures e. using the right solutions 2. One indication to wear soft contact lenses is which of the following? a. precise vision b. marginally dry eyes c. sports involvement d. ability to modify the size of the lens e. the presence of giant papillary conjunctivitis 3. Assessing the patient for contact lens wear of any type begins with: a. keratometry b. lensometry c. corneal topography d. tear function testing e. history taking 4. Indications for rigid contact lens wear include: a. part-time wear b. immediate comfort c. low visual expectations d. concern with the cost of lens maintenance e. immediate, all day wear 5. One reason for failure to successfully wear contacts is: a. inadequate tear production b. blue eyes c. spherical corneas d. small pupils e. glaucoma 6. It is important to rinse out fluorescein dye before fitting this type of contact: a. PMMA lenses b. HEMA lenses c. gas-permeable lenses d. complicated lens designs e. all of the above 7. The larger the radius of curvature of a contact lens, the: a. steeper the lens b. flatter the lens c. larger the diameter d. smaller the diameter e. shallower the “vault” of the lens Basic Principles of Contact Lens Fitting 2 8. Your patient has “K” readings of 41.50 D, spherical. You would choose which type of soft contact lens to start with: a. manufacturer’s flattest base curve b. manufacturer’s medium base curve c. manufacturer’s steepest base curve d. any of the above e. none of the above 9. “Myopia Creep” means: a. the lens “creeps up” with each blink b. the lens “creeps down” with each blink c. the cornea gets flatter from dehydration d. the cornea gets steeper from fluid retention e. none of the above 10. Your patient reports that their vision seems sharpest immediately before they blink each time, you might suspect: a. the lens needs astigmatic power b. a “too flat” base curve c. the lens is too small d. the lens is too large e. a lower water content lens is indicated 11. To make a lens fit looser on the eye, you would make it: a. toric b. keratoconic c. flatter d. more powerful e. steeper 12. Which of the following is a characteristic of an optimum soft contact lens fit? a. vision clearest right before each blink b. vision clearest right after each blink c. baring of the limbus with each blink d. lens centration down and out e. 1-1.5 mm movement with each blink 13. “Alignment” fitting is best used: a. against the rule astigmatism b. with the rule astigmatism c. lenticular astigmatism d. oblique astigmatism e. none of the above 14. One characteristic of a flat fitting rigid lens is: a. “seal-off” at the periphery b. decreased tear exchange c. excessive movement d. apical clearance e. central pooling 15. A myoflange edge helps rigid lenses “pick-up” in which type of refractive condition? a. high myopia b. hyperopia c. with the rule astigmatism d. against the rule astigmatism e. irregular astigmatism Basic Principles of Contact Lens Fitting 3 16. Which type of lens would be used when the corneal curvature is spherical but there is residual astigmatism? a. front toric b. back toric c. aspheric d. lenticular e. prism ballasted 17. The following numbers represent base curves. Which would be the steepest? a. 8.30 b. 7.80 c. 7.50 d. 7.10 e. 6.90 18. An example of “with the rule” astigmatism, expressed in a keratometer reading, would be which of the following? a. 43.50 X 090 / 42.00 X 180 b. 44.00 X 180 / 44.00 X 090 c. 41.50 X 090 / 43.00 X 180 d. 45.50 X 075 / 46.25 X 165 e. 43.75 X 045 / 41.25 X 135 19. A fluorescein pattern with an absence of dye under the center of the lens indicates a lens that is: a. too steep b. warped c. too flat d. clearing apically e. back toric on a spherical cornea For the following three questions (20, 21, and 22), match the instrument to the feature it is used to verify on contact lenses: a. thickness gauge b. geneva lens clock c. lensometer d. radiuscope e. “V” groove 20. Front vertex power 21. Base Curve 22. Lens diameter Basic Principles of Contact Lens Fitting 4 COVE Answer Sheet This quiz is worth 1.5 JCAHPO Group A continuing education credits. To obtain the video, call the American Academy of Ophthalmology (AAO) at (415) 561-8540 or visit www.aao.org You must complete the enclosed quiz on your own and may not seek assistance from other individuals in completing the quiz. You may, however, seek assistance from other individuals for clarification and understanding of the article content. Failure to comply with this policy may result in the revocation of credit. BASIC PRINCIPLES OF CONTACT LENS FITTING Name JCAHPO Certification Home Address City / State / Zip Home Phone Work Phone E-mail Address Signature PAYMENT INFORMATION - ALLOW 2-4 WEEKS FOR PROCESSING Price ATPO Member – $15.00 ATPO Member – Complimentary* Non-Member – $22.50 Rush Processing - $10.00 Method Method of Payment: Check (payable to ATPO) VISA MasterCard Discover Credit Card #: __________________________________________________________________________________________ Expiration Date: _________________________ Security (SVC) Code (on back of credit card): ___________________________ Name of Cardholder (please print): __________________________________________________________________________ Cardholder’s billing address: _______________________________________________________________________________ Cardholder’s Signature: __________________________________________________________________________________ Place your answers to each question in the appropriate space adjacent to the question number. 1. 7. 13. 19. 2. 8. 14. 20. 3. 9. 15. 21. 4. 10. 16. 22. 5. 11. 17. 6. 12. 18. By filling in the above spaces and signing your name, you agree that: • A total of 75% or more correct is a passing score. • ATPO is not responsible for Answer Sheets and Evaluation Forms not received at the ATPO offices. I attest that I have completed this quiz on my own. ___________________________________________________________ (SIGNATURE) Return completed answer sheet, evaluation form, and Questions? payment, to: Visit www.atpo.org ATPO Call (800) 482-4858 Attn: CE Dept 2025 Woodlane Drive St. Paul, MN 55125 Fax: (651) 731-0410 Basic Principles of Contact Lens Fitting 5 COVE Evaluation BASIC PRINCIPLES OF CONTACT LENS FITTING Please read each question carefully. Your feedback is important to us. Thank you! 1. How long have you been employed in the field of ophthalmology? years 2. This video was designed at a level right for me. (circle one) YES NO 3. Please read the following statements. Then, circle the number corresponding to the degree to which you agree with each statement. 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